diff --git a/app/lib/domain/waypoint/flat_waypoint_list.dart b/app/lib/domain/waypoint/flat_waypoint_list.dart
index 19efd06..c2cacd2 100644
--- a/app/lib/domain/waypoint/flat_waypoint_list.dart
+++ b/app/lib/domain/waypoint/flat_waypoint_list.dart
@@ -15,6 +15,9 @@ class Waypoint {
     this.action = WaypointAction.none,
     this.jumpTargetIndex,
     this.jumpRepeatCount,
+    this.windSpeedMs,
+    this.windDirFromDeg,
+    this.windElevationM,
   });
 
   final double lat;
@@ -30,6 +33,19 @@ class Waypoint {
   /// Nur bei action == jump gesetzt; null bedeutet Endlos-Wiederholung.
   final int? jumpRepeatCount;
 
+  /// Auf Hoehe altitudeM interpolierte Windgeschwindigkeit (Doku 3.8), null
+  /// bis "Fetch wind" ausgefuehrt wurde. Reine Planungshilfe, nicht Teil des
+  /// protokollneutralen Missionsinhalts - der Encoder liest diese Felder nie.
+  final double? windSpeedMs;
+
+  /// Windrichtung, aus der der Wind weht (Grad, 0=Nord), analog windSpeedMs.
+  final double? windDirFromDeg;
+
+  /// Bodenhoehe (ASL) am Wegpunkt, wie von der Wind-API geliefert - noetig,
+  /// um windSpeedMs/windDirFromDeg spaeter neu zu interpolieren oder
+  /// anzuzeigen (z.B. "interpoliert auf X m AMSL").
+  final double? windElevationM;
+
   Waypoint copyWith({
     double? lat,
     double? lon,
@@ -39,6 +55,9 @@ class Waypoint {
     WaypointAction? action,
     int? jumpTargetIndex,
     int? jumpRepeatCount,
+    double? windSpeedMs,
+    double? windDirFromDeg,
+    double? windElevationM,
   }) {
     return Waypoint(
       lat: lat ?? this.lat,
@@ -49,6 +68,9 @@ class Waypoint {
       action: action ?? this.action,
       jumpTargetIndex: jumpTargetIndex ?? this.jumpTargetIndex,
       jumpRepeatCount: jumpRepeatCount ?? this.jumpRepeatCount,
+      windSpeedMs: windSpeedMs ?? this.windSpeedMs,
+      windDirFromDeg: windDirFromDeg ?? this.windDirFromDeg,
+      windElevationM: windElevationM ?? this.windElevationM,
     );
   }
 }
diff --git a/app/lib/domain/wind/wind_math.dart b/app/lib/domain/wind/wind_math.dart
new file mode 100644
index 0000000..92fe0db
--- /dev/null
+++ b/app/lib/domain/wind/wind_math.dart
@@ -0,0 +1,130 @@
+import 'dart:math' as math;
+
+import '../waypoint/flat_waypoint_list.dart';
+
+/// Ein Stuetzpunkt fuer die Windinterpolation: Windgeschwindigkeit/-richtung
+/// in einer bestimmten Hoehe ueber dem Meeresspiegel (AMSL). Kombiniert aus
+/// Druckflaechen- und festen Nabenhoehen-Daten (Doku 3.8,
+/// buildCombinedWindLevels() im HTML-Demonstrator).
+class WindLevel {
+  const WindLevel({
+    required this.heightAmslM,
+    required this.speedMs,
+    required this.dirFromDeg,
+  });
+
+  final double heightAmslM;
+  final double speedMs;
+  final double dirFromDeg;
+}
+
+/// Interpoliertes Windergebnis an einer bestimmten Zielhoehe.
+class WindSample {
+  const WindSample({required this.speedMs, required this.dirFromDeg});
+
+  final double speedMs;
+  final double dirFromDeg;
+}
+
+/// Kreisfoermige Interpolation zwischen zwei Windrichtungen (kuerzester Weg
+/// ueber die 0/360-Grenze), analog interpolateAngle() im HTML-Demonstrator.
+double interpolateAngle(double a, double b, double frac) {
+  final diff = ((b - a + 540) % 360) - 180;
+  return (a + diff * frac + 360) % 360;
+}
+
+/// Lineare Interpolation zwischen den zwei Hoehen-Stuetzpunkten, die
+/// [targetHeightAmslM] einschliessen; ausserhalb des Stuetzpunktbereichs wird
+/// auf den jeweils naechstgelegenen Rand geklemmt (analog
+/// interpolateWindAtHeight() im HTML-Demonstrator). Gibt null zurueck, wenn
+/// keine Stuetzpunkte vorhanden sind.
+WindSample? interpolateWindAtHeight(
+  List<WindLevel> levels,
+  double targetHeightAmslM,
+) {
+  if (levels.isEmpty) return null;
+  final sorted = [...levels]
+    ..sort((a, b) => a.heightAmslM.compareTo(b.heightAmslM));
+
+  final first = sorted.first;
+  if (targetHeightAmslM <= first.heightAmslM) {
+    return WindSample(speedMs: first.speedMs, dirFromDeg: first.dirFromDeg);
+  }
+  final last = sorted.last;
+  if (targetHeightAmslM >= last.heightAmslM) {
+    return WindSample(speedMs: last.speedMs, dirFromDeg: last.dirFromDeg);
+  }
+  for (var i = 0; i < sorted.length - 1; i++) {
+    final a = sorted[i];
+    final b = sorted[i + 1];
+    if (targetHeightAmslM >= a.heightAmslM &&
+        targetHeightAmslM <= b.heightAmslM) {
+      final span = b.heightAmslM - a.heightAmslM;
+      final frac = span == 0 ? 0.0 : (targetHeightAmslM - a.heightAmslM) / span;
+      return WindSample(
+        speedMs: a.speedMs + (b.speedMs - a.speedMs) * frac,
+        dirFromDeg: interpolateAngle(a.dirFromDeg, b.dirFromDeg, frac),
+      );
+    }
+  }
+  return WindSample(speedMs: last.speedMs, dirFromDeg: last.dirFromDeg);
+}
+
+/// Grosskreis-Peilung von (lat1,lon1) nach (lat2,lon2) in Grad (0=Nord),
+/// analog bearingBetween() im HTML-Demonstrator.
+double bearingBetweenDeg(double lat1, double lon1, double lat2, double lon2) {
+  final lat1Rad = lat1 * math.pi / 180;
+  final lat2Rad = lat2 * math.pi / 180;
+  final dLon = (lon2 - lon1) * math.pi / 180;
+  final y = math.sin(dLon) * math.cos(lat2Rad);
+  final x = math.cos(lat1Rad) * math.sin(lat2Rad) -
+      math.sin(lat1Rad) * math.cos(lat2Rad) * math.cos(dLon);
+  return (math.atan2(y, x) * 180 / math.pi + 360) % 360;
+}
+
+/// Rueckenwind-Komponente (positiv) bzw. Gegenwind-Komponente (negativ)
+/// entlang eines Kurses, analog headTailwindComponent() im HTML-
+/// Demonstrator: Wind, der genau von hinten kommt, ergibt +windSpeedMs.
+double headTailwindComponent(
+  double bearingDeg,
+  double windSpeedMs,
+  double windDirFromDeg,
+) {
+  final windToward = (windDirFromDeg + 180) % 360;
+  final diff = (windToward - bearingDeg) * math.pi / 180;
+  return windSpeedMs * math.cos(diff);
+}
+
+/// Windkomponente auf dem Leg von [a] nach [b], interpoliert aus dem am
+/// Zielwegpunkt [b] hinterlegten Wind (analog computeLegWindComponent() im
+/// HTML-Demonstrator - der Zielpunkt bestimmt den massgeblichen Wind fuer
+/// dieses Leg). Null, solange fuer [b] noch kein Wind geladen wurde.
+double? computeLegWindComponent(Waypoint a, Waypoint b) {
+  final windSpeedMs = b.windSpeedMs;
+  final windDirFromDeg = b.windDirFromDeg;
+  if (windSpeedMs == null || windDirFromDeg == null) return null;
+  final bearing = bearingBetweenDeg(a.lat, a.lon, b.lat, b.lon);
+  return headTailwindComponent(bearing, windSpeedMs, windDirFromDeg);
+}
+
+/// Windkomponente pro Leg der gesamten Route (Laenge waypoints.length - 1).
+List<double?> computeLegWind(List<Waypoint> waypoints) {
+  return [
+    for (var i = 0; i < waypoints.length - 1; i++)
+      computeLegWindComponent(waypoints[i], waypoints[i + 1]),
+  ];
+}
+
+/// Erreichbare Bodengeschwindigkeit pro Leg (Soll-Geschwindigkeit des
+/// Zielwegpunkts + Windkomponente), null wo noch kein Wind geladen ist -
+/// analog der groundSpeeds-Berechnung in buildFullChart() im HTML-
+/// Demonstrator.
+List<double?> computeGroundSpeeds(List<Waypoint> waypoints) {
+  return [
+    for (var i = 0; i < waypoints.length - 1; i++)
+      switch (computeLegWindComponent(waypoints[i], waypoints[i + 1])) {
+        final wind? => waypoints[i + 1].speedMs + wind,
+        null => null,
+      },
+  ];
+}
diff --git a/app/lib/services/wind/wind_service.dart b/app/lib/services/wind/wind_service.dart
new file mode 100644
index 0000000..1585557
--- /dev/null
+++ b/app/lib/services/wind/wind_service.dart
@@ -0,0 +1,358 @@
+import 'dart:convert';
+
+import 'package:http/http.dart' as http;
+
+import '../../domain/waypoint/flat_waypoint_list.dart';
+import '../../domain/wind/wind_math.dart';
+
+/// Kombinierte Stuetzpunkte fuer die Windinterpolation an einem Ort, plus die
+/// dort zugrunde liegende Bodenhoehe (ASL) - analog buildCombinedWindLevels()
+/// im HTML-Demonstrator (Doku 3.8).
+class WindCombinedLevels {
+  const WindCombinedLevels({required this.levels, required this.elevationM});
+
+  final List<WindLevel> levels;
+  final double elevationM;
+}
+
+class WindValidationFixedReading {
+  const WindValidationFixedReading({
+    required this.heightAglM,
+    this.speedMs,
+    this.dirFromDeg,
+  });
+
+  final int heightAglM;
+  final double? speedMs;
+  final double? dirFromDeg;
+}
+
+class WindValidationPressureReading {
+  const WindValidationPressureReading({
+    required this.pressureHpa,
+    this.heightAmslM,
+    this.speedMs,
+    this.dirFromDeg,
+    required this.excluded,
+  });
+
+  final int pressureHpa;
+  final double? heightAmslM;
+  final double? speedMs;
+  final double? dirFromDeg;
+
+  /// True, wenn dieser Stuetzpunkt unvollstaendig ist oder unterhalb der
+  /// Bodenhoehe liegt und daher von der Interpolation ausgeschlossen wurde.
+  final bool excluded;
+}
+
+/// Ergebnis des Wind-Validierungspanels (Doku 3.8): rohe Messwerte auf
+/// festen Nabenhoehen und Druckflaechen, damit nachvollziehbar bleibt, wie
+/// der interpolierte Wert an [interpolatedAt120] zustande kam.
+class WindValidationResult {
+  const WindValidationResult({
+    required this.lat,
+    required this.lon,
+    required this.elevationM,
+    required this.fixedRequestFailed,
+    required this.fixedReadings,
+    this.gustMs,
+    required this.pressureRequestFailed,
+    required this.pressureReadings,
+    this.interpolatedAt120,
+  });
+
+  final double lat;
+  final double lon;
+  final double elevationM;
+  final bool fixedRequestFailed;
+  final List<WindValidationFixedReading> fixedReadings;
+  final double? gustMs;
+  final bool pressureRequestFailed;
+  final List<WindValidationPressureReading> pressureReadings;
+  final WindSample? interpolatedAt120;
+}
+
+/// Holt und kombiniert Winddaten von Open-Meteo (Doku 3.8). Zwei getrennte,
+/// fokussierte Requests (Druckflaechen + feste Nabenhoehen) statt eines
+/// kombinierten - ein 35-Variablen-Request verursachte im HTML-Demonstrator
+/// Modellauswahl-Fehler (Doku 4.10).
+class WindService {
+  WindService({http.Client? client}) : _client = client ?? http.Client();
+
+  final http.Client _client;
+
+  static const _pressureLevels = [1000, 975, 950, 925, 900, 850, 800, 750, 700];
+  static const _fixedHeights = [10, 80, 120, 180];
+
+  Uri _pressureUri(String lats, String lons) {
+    final vars = _pressureLevels
+        .map((p) =>
+            'wind_speed_${p}hPa,wind_direction_${p}hPa,geopotential_height_${p}hPa')
+        .join(',');
+    return Uri.https('api.open-meteo.com', '/v1/forecast', {
+      'latitude': lats,
+      'longitude': lons,
+      'hourly': vars,
+      'wind_speed_unit': 'ms',
+      'timezone': 'UTC',
+      'forecast_days': '1',
+    });
+  }
+
+  Uri _fixedUri(String lats, String lons) {
+    final vars =
+        '${_fixedHeights.map((h) => 'wind_speed_${h}m,wind_direction_${h}m').join(',')},wind_gusts_10m';
+    return Uri.https('api.open-meteo.com', '/v1/forecast', {
+      'latitude': lats,
+      'longitude': lons,
+      'hourly': vars,
+      'wind_speed_unit': 'ms',
+      'timezone': 'UTC',
+      'forecast_days': '1',
+    });
+  }
+
+  Future<dynamic> _fetchJson(Uri uri) async {
+    try {
+      final response =
+          await _client.get(uri).timeout(const Duration(seconds: 8));
+      if (response.statusCode != 200) return null;
+      return jsonDecode(response.body);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  /// Open-Meteo liefert bei einem einzelnen Ort ein Objekt, bei mehreren
+  /// kommagetrennten Koordinaten ein Array - hier auf eine einheitliche
+  /// Liste fester Laenge normalisiert.
+  List<Map<String, dynamic>?> _asResultList(dynamic decoded, int expectedCount) {
+    if (decoded is List) {
+      return List.generate(
+        expectedCount,
+        (i) => i < decoded.length ? decoded[i] as Map<String, dynamic>? : null,
+      );
+    }
+    if (decoded is Map<String, dynamic>) {
+      return [decoded, ...List<Map<String, dynamic>?>.filled(expectedCount - 1, null)];
+    }
+    return List<Map<String, dynamic>?>.filled(expectedCount, null);
+  }
+
+  int _nearestHourIndex(List<dynamic> time) {
+    final now = DateTime.now().toUtc();
+    var bestIdx = 0;
+    var bestDiffMs = double.infinity;
+    for (var i = 0; i < time.length; i++) {
+      final t = DateTime.parse('${time[i]}:00Z');
+      final diffMs = t.difference(now).inMilliseconds.abs().toDouble();
+      if (diffMs < bestDiffMs) {
+        bestDiffMs = diffMs;
+        bestIdx = i;
+      }
+    }
+    return bestIdx;
+  }
+
+  /// Vereint Druckflaechen- und feste Nabenhoehen-Daten zu einer
+  /// gemeinsamen Stuetzpunktliste (AGL-Hoehen der Nabenhoehen werden dazu in
+  /// ASL umgerechnet). Entweder Quelle darf fehlen (null); genutzt wird, was
+  /// vorhanden ist - analog buildCombinedWindLevels() im HTML-Demonstrator.
+  WindCombinedLevels buildCombinedWindLevels(
+    Map<String, dynamic>? pressureRes,
+    Map<String, dynamic>? fixedRes,
+  ) {
+    final levels = <WindLevel>[];
+    var elevation = 0.0;
+
+    final pHourly = pressureRes?['hourly'] as Map<String, dynamic>?;
+    final pTime = pHourly?['time'] as List<dynamic>?;
+    if (pHourly != null && pTime != null && pTime.isNotEmpty) {
+      final idx = _nearestHourIndex(pTime);
+      elevation = (pressureRes?['elevation'] as num?)?.toDouble() ?? 0.0;
+      for (final p in _pressureLevels) {
+        final h = (pHourly['geopotential_height_${p}hPa'] as List?)?[idx];
+        final s = (pHourly['wind_speed_${p}hPa'] as List?)?[idx];
+        final d = (pHourly['wind_direction_${p}hPa'] as List?)?[idx];
+        if (h is num && s is num && d is num && h >= elevation) {
+          levels.add(WindLevel(
+            heightAmslM: h.toDouble(),
+            speedMs: s.toDouble(),
+            dirFromDeg: d.toDouble(),
+          ));
+        }
+      }
+    }
+
+    final fHourly = fixedRes?['hourly'] as Map<String, dynamic>?;
+    final fTime = fHourly?['time'] as List<dynamic>?;
+    if (fHourly != null && fTime != null && fTime.isNotEmpty) {
+      final idx = _nearestHourIndex(fTime);
+      if (elevation == 0.0) {
+        elevation = (fixedRes?['elevation'] as num?)?.toDouble() ?? 0.0;
+      }
+      for (final h in _fixedHeights) {
+        final s = (fHourly['wind_speed_${h}m'] as List?)?[idx];
+        final d = (fHourly['wind_direction_${h}m'] as List?)?[idx];
+        if (s is num && d is num) {
+          levels.add(WindLevel(
+            heightAmslM: elevation + h,
+            speedMs: s.toDouble(),
+            dirFromDeg: d.toDouble(),
+          ));
+        }
+      }
+    }
+
+    return WindCombinedLevels(levels: levels, elevationM: elevation);
+  }
+
+  /// Wind, interpoliert auf 120 m AGL ueber dem Referenzort (erster
+  /// Wegpunkt, sonst Kartenzentrum) - fuer die Kopfleisten-Pille.
+  Future<WindSample?> fetchHeaderWind(double lat, double lon) async {
+    final results = await Future.wait([
+      _fetchJson(_pressureUri(lat.toStringAsFixed(5), lon.toStringAsFixed(5))),
+      _fetchJson(_fixedUri(lat.toStringAsFixed(5), lon.toStringAsFixed(5))),
+    ]);
+    final pressureRes = _asResultList(results[0], 1)[0];
+    final fixedRes = _asResultList(results[1], 1)[0];
+    final combined = buildCombinedWindLevels(pressureRes, fixedRes);
+    if (combined.levels.isEmpty) return null;
+    return interpolateWindAtHeight(combined.levels, combined.elevationM + 120);
+  }
+
+  /// Holt Wind fuer alle Wegpunkte in einem gebuendelten Request (Open-Meteo
+  /// akzeptiert kommagetrennte Koordinatenlisten) und interpoliert jeweils
+  /// auf die tatsaechliche Zielhoehe (Bodenhoehe + Soll-Altitude) - analog
+  /// fetchWindForWaypoints() im HTML-Demonstrator.
+  Future<List<Waypoint>> fetchWindForWaypoints(List<Waypoint> waypoints) async {
+    if (waypoints.isEmpty) return waypoints;
+    final lats = waypoints.map((w) => w.lat.toStringAsFixed(5)).join(',');
+    final lons = waypoints.map((w) => w.lon.toStringAsFixed(5)).join(',');
+    final results = await Future.wait([
+      _fetchJson(_pressureUri(lats, lons)),
+      _fetchJson(_fixedUri(lats, lons)),
+    ]);
+    final pressureResults = _asResultList(results[0], waypoints.length);
+    final fixedResults = _asResultList(results[1], waypoints.length);
+
+    return [
+      for (var i = 0; i < waypoints.length; i++)
+        _applyWind(waypoints[i], pressureResults[i], fixedResults[i]),
+    ];
+  }
+
+  Waypoint _applyWind(
+    Waypoint wp,
+    Map<String, dynamic>? pressureRes,
+    Map<String, dynamic>? fixedRes,
+  ) {
+    final combined = buildCombinedWindLevels(pressureRes, fixedRes);
+    if (combined.levels.isEmpty) return wp;
+    final result = interpolateWindAtHeight(
+      combined.levels,
+      combined.elevationM + wp.altitudeM,
+    );
+    if (result == null) return wp;
+    return wp.copyWith(
+      windSpeedMs: result.speedMs,
+      windDirFromDeg: result.dirFromDeg,
+      windElevationM: combined.elevationM,
+    );
+  }
+
+  /// Detaillierte Rohdaten fuer das Wind-Validierungspanel: einzelne
+  /// Messwerte je Nabenhoehe/Druckflaeche, damit nachvollziehbar bleibt, wie
+  /// der interpolierte 120-m-Wert zustande kam (Doku 3.8/4.9: Boeen nur
+  /// hier, nicht in der Wegpunktanzeige).
+  Future<WindValidationResult> fetchValidation(double lat, double lon) async {
+    final lats = lat.toStringAsFixed(5);
+    final lons = lon.toStringAsFixed(5);
+    final results = await Future.wait([
+      _fetchJson(_fixedUri(lats, lons)),
+      _fetchJson(_pressureUri(lats, lons)),
+    ]);
+    final fixedRes = _asResultList(results[0], 1)[0];
+    final pressureRes = _asResultList(results[1], 1)[0];
+
+    final elevation = ((fixedRes?['elevation'] as num?) ??
+            (pressureRes?['elevation'] as num?))
+        ?.toDouble() ??
+        0.0;
+
+    var fixedReadings = <WindValidationFixedReading>[];
+    double? gust;
+    final fHourly = fixedRes?['hourly'] as Map<String, dynamic>?;
+    final fTime = fHourly?['time'] as List<dynamic>?;
+    final fixedFailed = fHourly == null || fTime == null || fTime.isEmpty;
+    if (!fixedFailed) {
+      final idx = _nearestHourIndex(fTime);
+      fixedReadings = [
+        for (final h in _fixedHeights)
+          WindValidationFixedReading(
+            heightAglM: h,
+            speedMs: ((fHourly['wind_speed_${h}m'] as List?)?[idx] as num?)
+                ?.toDouble(),
+            dirFromDeg: ((fHourly['wind_direction_${h}m'] as List?)?[idx] as num?)
+                ?.toDouble(),
+          ),
+      ];
+      gust = ((fHourly['wind_gusts_10m'] as List?)?[idx] as num?)?.toDouble();
+    }
+
+    var pressureReadings = <WindValidationPressureReading>[];
+    final pHourly = pressureRes?['hourly'] as Map<String, dynamic>?;
+    final pTime = pHourly?['time'] as List<dynamic>?;
+    final pressureFailed = pHourly == null || pTime == null || pTime.isEmpty;
+    if (!pressureFailed) {
+      final idx = _nearestHourIndex(pTime);
+      pressureReadings = [
+        for (final p in _pressureLevels)
+          _pressureReadingAt(pHourly, idx, p, elevation),
+      ];
+    }
+
+    final combined = buildCombinedWindLevels(pressureRes, fixedRes);
+    final interpolated = combined.levels.isEmpty
+        ? null
+        : interpolateWindAtHeight(combined.levels, elevation + 120);
+
+    return WindValidationResult(
+      lat: lat,
+      lon: lon,
+      elevationM: elevation,
+      fixedRequestFailed: fixedFailed,
+      fixedReadings: fixedReadings,
+      gustMs: gust,
+      pressureRequestFailed: pressureFailed,
+      pressureReadings: pressureReadings,
+      interpolatedAt120: interpolated,
+    );
+  }
+
+  WindValidationPressureReading _pressureReadingAt(
+    Map<String, dynamic> hourly,
+    int idx,
+    int pressureHpa,
+    double elevationM,
+  ) {
+    final h = (hourly['geopotential_height_${pressureHpa}hPa'] as List?)?[idx];
+    final s = (hourly['wind_speed_${pressureHpa}hPa'] as List?)?[idx];
+    final d = (hourly['wind_direction_${pressureHpa}hPa'] as List?)?[idx];
+    final heightAmslM = h is num ? h.toDouble() : null;
+    final speedMs = s is num ? s.toDouble() : null;
+    final dirFromDeg = d is num ? d.toDouble() : null;
+    final excluded = heightAmslM == null ||
+        speedMs == null ||
+        dirFromDeg == null ||
+        heightAmslM < elevationM;
+    return WindValidationPressureReading(
+      pressureHpa: pressureHpa,
+      heightAmslM: heightAmslM,
+      speedMs: speedMs,
+      dirFromDeg: dirFromDeg,
+      excluded: excluded,
+    );
+  }
+}
diff --git a/app/lib/ui/providers/current_mission_provider.dart b/app/lib/ui/providers/current_mission_provider.dart
index 2d6c013..ae073d1 100644
--- a/app/lib/ui/providers/current_mission_provider.dart
+++ b/app/lib/ui/providers/current_mission_provider.dart
@@ -14,6 +14,13 @@ class CurrentMissionNotifier extends Notifier<List<Waypoint>> {
     state = [...state, waypoint];
   }
 
+  /// Ersetzt die gesamte Liste (z.B. nach "Fetch wind", das alle Wegpunkte
+  /// gebuendelt in einem Schritt aktualisiert - anders als die uebrigen
+  /// Setter hier, die genau einen Wegpunkt betreffen).
+  void replaceAll(List<Waypoint> waypoints) {
+    state = waypoints;
+  }
+
   /// Aktualisiert die Position eines Wegpunkts (Drag-to-Reposition im
   /// Editier-Modus: Kartenverschieben bewegt den Zielpunkt live mit).
   void moveWaypoint(int index, double lat, double lon) {
diff --git a/app/lib/ui/providers/wind_provider.dart b/app/lib/ui/providers/wind_provider.dart
new file mode 100644
index 0000000..c0ca276
--- /dev/null
+++ b/app/lib/ui/providers/wind_provider.dart
@@ -0,0 +1,91 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../domain/wind/wind_math.dart';
+import '../../services/wind/wind_service.dart';
+import 'current_mission_provider.dart';
+import 'map_controller_provider.dart';
+
+final windServiceProvider = Provider<WindService>((ref) => WindService());
+
+/// Zustand der Kopfleisten-Wind-Pille (Doku 3.8).
+class HeaderWindState {
+  const HeaderWindState({
+    this.sample,
+    this.loading = false,
+    this.showPerWaypoint = false,
+  });
+
+  final WindSample? sample;
+  final bool loading;
+
+  /// Umschaltbar per Antippen der Pille (HTML-Demonstrator:
+  /// showPerWaypointWind) - blendet Wind-Marker an jedem Wegpunkt ein/aus.
+  final bool showPerWaypoint;
+
+  HeaderWindState copyWith({
+    WindSample? sample,
+    bool? loading,
+    bool? showPerWaypoint,
+  }) {
+    return HeaderWindState(
+      sample: sample ?? this.sample,
+      loading: loading ?? this.loading,
+      showPerWaypoint: showPerWaypoint ?? this.showPerWaypoint,
+    );
+  }
+}
+
+/// Haelt den fuer die Kopfleiste interpolierten Wind (120 m AGL ueber dem
+/// Referenzort: erster Wegpunkt, sonst aktuelles Kartenzentrum) - analog
+/// refreshHeaderWind()/headerWindLocation() im HTML-Demonstrator.
+class HeaderWindNotifier extends Notifier<HeaderWindState> {
+  @override
+  HeaderWindState build() => const HeaderWindState();
+
+  Future<void> refresh() async {
+    final waypoints = ref.read(currentMissionProvider);
+    (double, double)? location;
+    if (waypoints.isNotEmpty) {
+      location = (waypoints.first.lat, waypoints.first.lon);
+    } else {
+      try {
+        final center = ref.read(mapControllerProvider).camera.center;
+        location = (center.latitude, center.longitude);
+      } catch (_) {
+        // Kamera noch nicht bereit (Karte noch nicht gemountet/gelayoutet).
+        location = null;
+      }
+    }
+    if (location == null) return;
+
+    state = state.copyWith(loading: true);
+    final sample =
+        await ref.read(windServiceProvider).fetchHeaderWind(location.$1, location.$2);
+    state = state.copyWith(loading: false, sample: sample);
+  }
+
+  void toggleShowPerWaypoint() {
+    state = state.copyWith(showPerWaypoint: !state.showPerWaypoint);
+  }
+}
+
+final headerWindProvider =
+    NotifierProvider<HeaderWindNotifier, HeaderWindState>(HeaderWindNotifier.new);
+
+/// Referenzort fuer Windabfragen ohne festen Bezugspunkt (Wind-
+/// Validierungspanel aus der Wegpunktliste): erster Wegpunkt, sonst
+/// aktuelles Kartenzentrum - analog headerWindLocation() im HTML-
+/// Demonstrator. Null, wenn die Karte noch nicht gemountet/gelayoutet ist.
+(double, double)? windReferenceLocation(WidgetRef ref) {
+  final waypoints = ref.read(currentMissionProvider);
+  if (waypoints.isNotEmpty) {
+    final first = waypoints.first;
+    return (first.lat, first.lon);
+  }
+  try {
+    final center = ref.read(mapControllerProvider).camera.center;
+    return (center.latitude, center.longitude);
+  } catch (_) {
+    return null;
+  }
+}
diff --git a/app/lib/ui/screens/plan/plan_screen.dart b/app/lib/ui/screens/plan/plan_screen.dart
index 6f12fd7..09d1104 100644
--- a/app/lib/ui/screens/plan/plan_screen.dart
+++ b/app/lib/ui/screens/plan/plan_screen.dart
@@ -11,6 +11,7 @@ import '../../../domain/mission/route_geometry.dart';
 import '../../../domain/waypoint/flat_waypoint_list.dart';
 import '../../providers/current_mission_provider.dart';
 import '../../providers/map_controller_provider.dart';
+import '../../providers/wind_provider.dart';
 import '../../widgets/bottom_stats_bar.dart';
 import '../../widgets/halo_menu.dart';
 import '../../widgets/mini_altitude_profile.dart';
@@ -67,6 +68,11 @@ class _PlanScreenState extends ConsumerState<PlanScreen> {
     super.initState();
     _mapController = ref.read(mapControllerProvider);
     _mapEventSub = _mapController.mapEventStream.listen(_onMapEvent);
+    // Erstbefuellung der Kopfleisten-Wind-Pille (Doku 3.8) - erst nach dem
+    // ersten Frame, da die Kartenkamera (Fallback-Referenzort ohne
+    // Wegpunkte) vor dem initialen Layout noch nicht bereit ist.
+    WidgetsBinding.instance
+        .addPostFrameCallback((_) => ref.read(headerWindProvider.notifier).refresh());
   }
 
   @override
@@ -163,6 +169,11 @@ class _PlanScreenState extends ConsumerState<PlanScreen> {
                 catchRadiusM: DefaultDroneProfile.catchRadiusM,
               ),
             );
+        if (waypoints.isEmpty) {
+          // Referenzort fuer die Wind-Pille wechselt vom Kartenzentrum auf
+          // den ersten Wegpunkt (Doku 3.8) - neu abfragen.
+          ref.read(headerWindProvider.notifier).refresh();
+        }
         setState(() {
           _targetIndex = waypoints.length;
           _mode = _ReticleMode.snapped;
diff --git a/app/lib/ui/widgets/full_value_chart.dart b/app/lib/ui/widgets/full_value_chart.dart
index ea2678d..6940369 100644
--- a/app/lib/ui/widgets/full_value_chart.dart
+++ b/app/lib/ui/widgets/full_value_chart.dart
@@ -27,6 +27,8 @@ class FullValueChart extends StatefulWidget {
     required this.pxPerUnit,
     required this.unit,
     required this.onChanged,
+    this.legWind,
+    this.groundSpeeds,
   });
 
   final List<Waypoint> waypoints;
@@ -41,6 +43,14 @@ class FullValueChart extends StatefulWidget {
   final String unit;
   final void Function(int index, double value) onChanged;
 
+  /// Kopf-/Rueckenwind-Komponente pro Leg (nur Speed-Tab, Doku 3.8) -
+  /// Laenge waypoints.length - 1, null wo noch kein Wind geladen ist.
+  final List<double?>? legWind;
+
+  /// Erreichbare Bodengeschwindigkeit pro Leg (nur Speed-Tab), gleiche
+  /// Laenge/Null-Semantik wie [legWind].
+  final List<double?>? groundSpeeds;
+
   static const _distance = Distance(roundResult: false);
 
   static List<double> cumulativeDistances(List<Waypoint> waypoints) {
@@ -66,9 +76,14 @@ class _FullValueChartState extends State<FullValueChart> {
   static const _hitToleranceX = 28.0;
 
   ({double lo, double hi}) _range() {
-    if (widget.values.isEmpty) return (lo: widget.min, hi: widget.max);
-    final dataMin = widget.values.reduce(math.min);
-    final dataMax = widget.values.reduce(math.max);
+    final allVals = <double>[
+      ...widget.values,
+      for (final v in widget.legWind ?? const <double?>[]) ?v,
+      for (final v in widget.groundSpeeds ?? const <double?>[]) ?v,
+    ];
+    if (allVals.isEmpty) return (lo: widget.min, hi: widget.max);
+    final dataMin = allVals.reduce(math.min);
+    final dataMax = allVals.reduce(math.max);
     final span = dataMax - dataMin;
     final pad = math.max(span * 0.35, widget.step * 2);
     var lo = dataMin - pad;
@@ -79,8 +94,11 @@ class _FullValueChartState extends State<FullValueChart> {
       lo = mid - minSpan / 2;
       hi = mid + minSpan / 2;
     }
-    if (lo < widget.min) lo = widget.min;
-    if (hi > widget.max) hi = widget.max;
+    // Nicht auf widget.min/max (gueltiger Drohnen-Geschwindigkeitsbereich)
+    // klemmen: Windkomponenten/Bodengeschwindigkeit (Doku 3.8) sind keine
+    // gueltigen Soll-Geschwindigkeiten und duerfen den sichtbaren Bereich
+    // durchaus unter min bzw. ueber max ziehen (HTML-Demonstrator:
+    // computeSpeedChartRange() klemmt ebenfalls nicht auf SPD_MIN/SPD_MAX).
     if (hi <= lo) {
       lo = widget.min;
       hi = widget.max;
@@ -154,6 +172,8 @@ class _FullValueChartState extends State<FullValueChart> {
               lo: range.lo,
               hi: range.hi,
               unit: widget.unit,
+              legWind: widget.legWind,
+              groundSpeeds: widget.groundSpeeds,
             ),
           ),
         );
@@ -173,6 +193,8 @@ class _ChartPainter extends CustomPainter {
     required this.lo,
     required this.hi,
     required this.unit,
+    this.legWind,
+    this.groundSpeeds,
   });
 
   final List<Waypoint> waypoints;
@@ -184,6 +206,8 @@ class _ChartPainter extends CustomPainter {
   final double lo;
   final double hi;
   final String unit;
+  final List<double?>? legWind;
+  final List<double?>? groundSpeeds;
 
   static const _padX = 50.0;
   static const _padY = 20.0;
@@ -238,6 +262,8 @@ class _ChartPainter extends CustomPainter {
       v += step;
     }
 
+    _paintWindAndGroundSpeed(canvas, boxW, boxH);
+
     // Verbindungslinien (rot bei nicht fliegbarer Steig-/Sinkrate).
     for (var i = 0; i < n - 1; i++) {
       final bad = i < legBad.length && legBad[i];
@@ -269,10 +295,136 @@ class _ChartPainter extends CustomPainter {
     }
   }
 
+  /// Wind-Diamanten je Leg (Kopf-/Rueckenwind-Komponente) und die daraus
+  /// erreichbare Bodengeschwindigkeit als gestrichelte Stufenlinie - nur auf
+  /// dem Speed-Tab genutzt (Doku 3.8, windHtml/groundSpeedHtml im HTML-
+  /// Demonstrator). Vor den eigentlichen Soll-Werte-Punkten gezeichnet,
+  /// damit diese immer obenauf liegen.
+  void _paintWindAndGroundSpeed(Canvas canvas, double boxW, double boxH) {
+    final wind = legWind;
+    if (wind != null && wind.any((v) => v != null)) {
+      final wZeroY = _yAt(0, boxH);
+      _drawDashedLine(
+        canvas,
+        Offset(_padX, wZeroY),
+        Offset(boxW - _padX, wZeroY),
+        Paint()
+          ..color = Colors.white.withValues(alpha: 0.4)
+          ..strokeWidth = 1.5,
+        dashWidth: 3,
+        gapWidth: 4,
+      );
+      final zeroLabel = TextPainter(
+        text: TextSpan(
+          text: '0 (no wind effect on track)',
+          style: TextStyle(color: Colors.white.withValues(alpha: 0.55), fontSize: 10),
+        ),
+        textDirection: TextDirection.ltr,
+      )..layout();
+      zeroLabel.paint(canvas, Offset(_padX, wZeroY - 5 - zeroLabel.height));
+
+      final windPts = <Offset>[];
+      for (var i = 0; i < wind.length; i++) {
+        final w = wind[i];
+        if (w == null) continue;
+        final mx = (_xAt(i, boxW) + _xAt(i + 1, boxW)) / 2;
+        final my = _yAt(w, boxH);
+        windPts.add(Offset(mx, my));
+
+        final isTail = w >= 0;
+        final color = isTail ? const Color(0xFF3ECF8E) : const Color(0xFFE2574A);
+        final diamond = Path()
+          ..moveTo(mx, my - 7)
+          ..lineTo(mx + 7, my)
+          ..lineTo(mx, my + 7)
+          ..lineTo(mx - 7, my)
+          ..close();
+        canvas.drawPath(diamond, Paint()..color = color);
+        canvas.drawPath(
+          diamond,
+          Paint()
+            ..color = const Color(0xFF0C0C0C)
+            ..style = PaintingStyle.stroke
+            ..strokeWidth = 1,
+        );
+
+        final valueLabel = TextPainter(
+          text: TextSpan(
+            text: '${isTail ? '+' : ''}${w.toStringAsFixed(1)}',
+            style: TextStyle(color: color, fontSize: 11, fontWeight: FontWeight.w600),
+          ),
+          textDirection: TextDirection.ltr,
+        )..layout();
+        valueLabel.paint(
+          canvas,
+          Offset(mx - valueLabel.width / 2, my - 12 - valueLabel.height),
+        );
+      }
+
+      final connectPaint = Paint()
+        ..color = Colors.white.withValues(alpha: 0.25)
+        ..strokeWidth = 1;
+      for (var i = 0; i < windPts.length - 1; i++) {
+        _drawDashedLine(canvas, windPts[i], windPts[i + 1], connectPaint,
+            dashWidth: 2, gapWidth: 3);
+      }
+    }
+
+    final ground = groundSpeeds;
+    if (ground != null) {
+      double? prevLevelY;
+      final groundPaint = Paint()
+        ..color = const Color(0xFF94BBE9).withValues(alpha: 0.55)
+        ..strokeWidth = 1.5;
+      for (var i = 0; i < ground.length; i++) {
+        final g = ground[i];
+        if (g == null) {
+          prevLevelY = null;
+          continue;
+        }
+        final gy = _yAt(g, boxH);
+        final gx0 = _xAt(i, boxW);
+        final gx1 = _xAt(i + 1, boxW);
+        _drawDashedLine(canvas, Offset(gx0, gy), Offset(gx1, gy), groundPaint,
+            dashWidth: 5, gapWidth: 3);
+        if (prevLevelY != null) {
+          _drawDashedLine(canvas, Offset(gx0, prevLevelY), Offset(gx0, gy),
+              groundPaint, dashWidth: 5, gapWidth: 3);
+        }
+        prevLevelY = gy;
+      }
+    }
+  }
+
+  void _drawDashedLine(
+    Canvas canvas,
+    Offset p1,
+    Offset p2,
+    Paint paint, {
+    double dashWidth = 4,
+    double gapWidth = 3,
+  }) {
+    final total = (p2 - p1).distance;
+    if (total == 0) return;
+    final direction = (p2 - p1) / total;
+    var traveled = 0.0;
+    while (traveled < total) {
+      final segEnd = math.min(traveled + dashWidth, total);
+      canvas.drawLine(
+        p1 + direction * traveled,
+        p1 + direction * segEnd,
+        paint,
+      );
+      traveled += dashWidth + gapWidth;
+    }
+  }
+
   @override
   bool shouldRepaint(covariant _ChartPainter oldDelegate) =>
       oldDelegate.values != values ||
       oldDelegate.activeIndex != activeIndex ||
       oldDelegate.lo != lo ||
-      oldDelegate.hi != hi;
+      oldDelegate.hi != hi ||
+      oldDelegate.legWind != legWind ||
+      oldDelegate.groundSpeeds != groundSpeeds;
 }
diff --git a/app/lib/ui/widgets/header_wind_pill.dart b/app/lib/ui/widgets/header_wind_pill.dart
new file mode 100644
index 0000000..8cd9faf
--- /dev/null
+++ b/app/lib/ui/widgets/header_wind_pill.dart
@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../providers/wind_provider.dart';
+import 'wind_arrow_icon.dart';
+
+/// Kopfleisten-Pille mit Windrichtung/-geschwindigkeit auf 120 m AGL ueber
+/// dem Referenzort (Doku 3.8). Antippen schaltet die Wind-Marker an jedem
+/// Wegpunkt ein/aus (HTML-Demonstrator: showPerWaypointWind).
+class HeaderWindPill extends ConsumerWidget {
+  const HeaderWindPill({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final state = ref.watch(headerWindProvider);
+    final sample = state.sample;
+    final active = state.showPerWaypoint;
+
+    return GestureDetector(
+      onTap: () => ref.read(headerWindProvider.notifier).toggleShowPerWaypoint(),
+      child: Container(
+        height: 34,
+        padding: const EdgeInsets.symmetric(horizontal: 10),
+        decoration: BoxDecoration(
+          color: active
+              ? const Color(0xFF4D9DFF).withValues(alpha: 0.32)
+              : Colors.black.withValues(alpha: 0.55),
+          borderRadius: BorderRadius.circular(17),
+          border: Border.all(
+            color: active
+                ? const Color(0xFF4D9DFF)
+                : Colors.white.withValues(alpha: 0.4),
+          ),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (sample != null) ...[
+              WindArrowIcon(dirFromDeg: sample.dirFromDeg, size: 15),
+              const SizedBox(width: 4),
+            ],
+            Text(
+              sample != null ? '${sample.speedMs.round()} m/s' : '—',
+              style: const TextStyle(
+                color: Colors.white,
+                fontSize: 12,
+                fontWeight: FontWeight.w500,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
diff --git a/app/lib/ui/widgets/top_mode_bar.dart b/app/lib/ui/widgets/top_mode_bar.dart
index 95d2ea2..cb1586c 100644
--- a/app/lib/ui/widgets/top_mode_bar.dart
+++ b/app/lib/ui/widgets/top_mode_bar.dart
@@ -3,6 +3,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../../app_mode/app_mode_cubit.dart';
 import '../dmc_colors.dart';
+import 'header_wind_pill.dart';
 import 'map_search_controls.dart';
 
 /// Persistente Kopfleiste zum Umschalten zwischen Plan- und Fly-Modus
@@ -10,11 +11,11 @@ import 'map_search_controls.dart';
 /// faerbt sich in der Farbe des aktiven Modus; der jeweils andere Modus wird
 /// als solider Button am Rand angeboten, um in ihn zu wechseln.
 ///
-/// Traegt ausserhalb des Fly-Modus zusaetzlich die Ortssuche und die
-/// Home-/Fit-Buttons in derselben Pille (HTML-Demonstrator: #searchWrap/
-/// #homeBtn/#fitBtn sitzen alle in #topBarMiddle, nicht in einer separaten
-/// Leiste) - dafuer lebt der MapController im mapControllerProvider statt
-/// als PlanScreen-privates Feld, siehe dort.
+/// Traegt ausserhalb des Fly-Modus zusaetzlich die Wind-Pille, Ortssuche und
+/// die Home-/Fit-Buttons in derselben Pille (HTML-Demonstrator: #headerWindPill/
+/// #searchWrap/#homeBtn/#fitBtn sitzen alle in #topBarMiddle, nicht in einer
+/// separaten Leiste) - dafuer lebt der MapController im mapControllerProvider
+/// statt als PlanScreen-privates Feld, siehe dort.
 class TopModeBar extends StatelessWidget {
   const TopModeBar({super.key});
 
@@ -50,7 +51,9 @@ class TopModeBar extends StatelessWidget {
               if (isFly)
                 const Spacer()
               else ...[
-                const SizedBox(width: 12),
+                const SizedBox(width: 8),
+                const HeaderWindPill(),
+                const SizedBox(width: 8),
                 const Expanded(child: MapSearchControls()),
                 const SizedBox(width: 12),
               ],
diff --git a/app/lib/ui/widgets/waypoint_list_panel.dart b/app/lib/ui/widgets/waypoint_list_panel.dart
index d8f76de..d6f3bb1 100644
--- a/app/lib/ui/widgets/waypoint_list_panel.dart
+++ b/app/lib/ui/widgets/waypoint_list_panel.dart
@@ -4,9 +4,13 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../domain/mission/default_drone_profile.dart';
 import '../../domain/mission/route_geometry.dart';
 import '../../domain/waypoint/flat_waypoint_list.dart';
+import '../../domain/wind/wind_math.dart';
 import '../providers/current_mission_provider.dart';
+import '../providers/wind_provider.dart';
 import 'full_value_chart.dart';
 import 'waypoint_chip.dart';
+import 'wind_arrow_icon.dart';
+import 'wind_validate_panel.dart';
 
 enum _PanelTab { list, altitude, speed }
 
@@ -76,6 +80,39 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
     super.dispose();
   }
 
+  /// Holt Wind fuer alle Wegpunkte gebuendelt (Doku 3.8, HTML-Demonstrator:
+  /// fetchWindForWaypoints()) und schreibt das Ergebnis komplett zurueck.
+  Future<void> _onFetchWind() async {
+    final waypoints = ref.read(currentMissionProvider);
+    final messenger = ScaffoldMessenger.of(context);
+    if (waypoints.isEmpty) {
+      messenger.showSnackBar(
+        const SnackBar(content: Text('No waypoints to fetch wind for')),
+      );
+      return;
+    }
+    messenger.showSnackBar(const SnackBar(content: Text('Fetching wind…')));
+    final updated =
+        await ref.read(windServiceProvider).fetchWindForWaypoints(waypoints);
+    ref.read(currentMissionProvider.notifier).replaceAll(updated);
+    messenger.showSnackBar(const SnackBar(content: Text('Wind data updated')));
+  }
+
+  /// Oeffnet das Wind-Validierungspanel fuer den aktuellen Referenzort
+  /// (erster Wegpunkt, sonst Kartenzentrum - Doku 3.8).
+  void _onValidateWind() {
+    final location = windReferenceLocation(ref);
+    if (location == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('No location available yet')),
+      );
+      return;
+    }
+    Navigator.of(context).push(MaterialPageRoute(
+      builder: (_) => WindValidatePanel(lat: location.$1, lon: location.$2),
+    ));
+  }
+
   /// Zentriert die Liste auf den aktuell aktiven Wegpunkt (Doku 3.6: das
   /// Panel oeffnet sich beim Editieren eines Wegpunkts ueber das
   /// Halo-Menue - ohne Auto-Scroll waere er bei laengeren Missionen nicht
@@ -123,6 +160,19 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
                       ),
                     ),
                   ),
+                  _HeaderActionButton(
+                    icon: Icons.air,
+                    label: 'Fetch wind',
+                    tint: const Color(0xFF4D9DFF),
+                    onTap: _onFetchWind,
+                  ),
+                  const SizedBox(width: 8),
+                  _HeaderActionButton(
+                    icon: Icons.rule,
+                    label: 'Validate',
+                    tint: const Color(0xFFC8A04D),
+                    onTap: _onValidateWind,
+                  ),
                   IconButton(
                     onPressed: widget.onClose,
                     icon: const Icon(Icons.close, color: Colors.white),
@@ -162,6 +212,8 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
                     pxPerUnit: 22,
                     unit: ' m/s',
                     onChanged: widget.onSpeedChanged,
+                    legWind: computeLegWind(waypoints),
+                    groundSpeeds: computeGroundSpeeds(waypoints),
                   ),
               },
             ),
@@ -215,6 +267,8 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
     required double pxPerUnit,
     required String unit,
     required void Function(int index, double value) onChanged,
+    List<double?>? legWind,
+    List<double?>? groundSpeeds,
   }) {
     return Padding(
       padding: const EdgeInsets.fromLTRB(8, 16, 8, 8),
@@ -230,6 +284,8 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
         pxPerUnit: pxPerUnit,
         unit: unit,
         onChanged: onChanged,
+        legWind: legWind,
+        groundSpeeds: groundSpeeds,
       ),
     );
   }
@@ -247,6 +303,7 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
                 Expanded(child: Text('SPEED', style: _headerStyle)),
                 Expanded(child: Text('EXECUTE', style: _headerStyle)),
                 Expanded(child: Text('CATCH', style: _headerStyle)),
+                Expanded(child: Text('WIND', style: _headerStyle)),
                 SizedBox(width: 76),
               ],
             ),
@@ -375,6 +432,19 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
                   : Text('${wp.catchRadiusM.round()} m',
                       style: const TextStyle(color: Colors.white)),
             ),
+            Expanded(
+              child: wp.windSpeedMs != null
+                  ? Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        WindArrowIcon(dirFromDeg: wp.windDirFromDeg!, size: 13),
+                        const SizedBox(width: 4),
+                        Text('${wp.windSpeedMs!.round()} m/s',
+                            style: const TextStyle(color: Colors.white)),
+                      ],
+                    )
+                  : const Text('—', style: TextStyle(color: Colors.white38)),
+            ),
             IconButton(
               onPressed: () => setState(
                 () => _rowEditIndex = isEditing ? -1 : index,
@@ -405,3 +475,49 @@ class _WaypointListPanelState extends ConsumerState<WaypointListPanel> {
         _ => '—',
       };
 }
+
+/// Kleiner getoenter Aktions-Button im Panel-Header (HTML-Demonstrator:
+/// #windFetchBtn/#windValidateBtn).
+class _HeaderActionButton extends StatelessWidget {
+  const _HeaderActionButton({
+    required this.icon,
+    required this.label,
+    required this.tint,
+    required this.onTap,
+  });
+
+  final IconData icon;
+  final String label;
+  final Color tint;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+        decoration: BoxDecoration(
+          color: tint.withValues(alpha: 0.18),
+          borderRadius: BorderRadius.circular(16),
+          border: Border.all(color: tint.withValues(alpha: 0.5)),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(icon, size: 15, color: Colors.white),
+            const SizedBox(width: 6),
+            Text(
+              label,
+              style: const TextStyle(
+                color: Colors.white,
+                fontSize: 13,
+                fontWeight: FontWeight.w600,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
diff --git a/app/lib/ui/widgets/wind_arrow_icon.dart b/app/lib/ui/widgets/wind_arrow_icon.dart
new file mode 100644
index 0000000..e6d2c1a
--- /dev/null
+++ b/app/lib/ui/widgets/wind_arrow_icon.dart
@@ -0,0 +1,28 @@
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+
+/// Windpfeil, der in die Richtung zeigt, in die der Wind weht (nicht woher
+/// er kommt) - analog windArrowSvg() im HTML-Demonstrator, dort ebenfalls
+/// um (dirFrom + 180) Grad gedreht.
+class WindArrowIcon extends StatelessWidget {
+  const WindArrowIcon({
+    super.key,
+    required this.dirFromDeg,
+    this.size = 14,
+    this.color = Colors.white,
+  });
+
+  final double dirFromDeg;
+  final double size;
+  final Color color;
+
+  @override
+  Widget build(BuildContext context) {
+    final towardDeg = (dirFromDeg + 180) % 360;
+    return Transform.rotate(
+      angle: towardDeg * math.pi / 180,
+      child: Icon(Icons.navigation, size: size, color: color),
+    );
+  }
+}
diff --git a/app/lib/ui/widgets/wind_validate_panel.dart b/app/lib/ui/widgets/wind_validate_panel.dart
new file mode 100644
index 0000000..b30afc9
--- /dev/null
+++ b/app/lib/ui/widgets/wind_validate_panel.dart
@@ -0,0 +1,152 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../services/wind/wind_service.dart';
+import '../providers/wind_provider.dart';
+
+/// Zeigt die Rohdaten hinter dem interpolierten Wind an einem Ort:
+/// gemessene Werte je fester Nabenhoehe (inkl. Boeen) und je Druckflaeche,
+/// sowie das daraus interpolierte Ergebnis auf 120 m AGL (Doku 3.8/4.9:
+/// Boeen nur hier, nicht in der Wegpunktanzeige). Fullscreen-Route wie
+/// WaypointListPanel (HTML-Demonstrator: #windValidatePanel, ebenfalls
+/// .panel).
+class WindValidatePanel extends ConsumerStatefulWidget {
+  const WindValidatePanel({super.key, required this.lat, required this.lon});
+
+  final double lat;
+  final double lon;
+
+  @override
+  ConsumerState<WindValidatePanel> createState() => _WindValidatePanelState();
+}
+
+class _WindValidatePanelState extends ConsumerState<WindValidatePanel> {
+  late final Future<WindValidationResult> _future;
+
+  @override
+  void initState() {
+    super.initState();
+    _future = ref
+        .read(windServiceProvider)
+        .fetchValidation(widget.lat, widget.lon);
+  }
+
+  static const _labelStyle = TextStyle(color: Colors.white, fontSize: 14, height: 1.6);
+  static const _errorStyle = TextStyle(color: Color(0xFFFF8A7A), fontSize: 14, height: 1.6);
+  static const _excludedStyle = TextStyle(
+    color: Colors.white38,
+    fontSize: 14,
+    height: 1.6,
+    decoration: TextDecoration.lineThrough,
+  );
+
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      color: const Color(0xEB080808),
+      child: SafeArea(
+        child: Column(
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 8, 12),
+              child: Row(
+                children: [
+                  const Expanded(
+                    child: Text(
+                      'Wind Validation',
+                      style: TextStyle(
+                        color: Colors.white,
+                        fontSize: 20,
+                        fontWeight: FontWeight.w700,
+                      ),
+                    ),
+                  ),
+                  IconButton(
+                    onPressed: () => Navigator.of(context).pop(),
+                    icon: const Icon(Icons.close, color: Colors.white),
+                  ),
+                ],
+              ),
+            ),
+            const Divider(color: Colors.white24, height: 1),
+            Expanded(
+              child: FutureBuilder<WindValidationResult>(
+                future: _future,
+                builder: (context, snapshot) {
+                  if (!snapshot.hasData) {
+                    return const Center(
+                      child: CircularProgressIndicator(color: Color(0xFF4D9DFF)),
+                    );
+                  }
+                  return _body(snapshot.data!);
+                },
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _body(WindValidationResult result) {
+    return ListView(
+      padding: const EdgeInsets.all(16),
+      children: [
+        Text(
+          'Location: ${result.lat.toStringAsFixed(5)}, ${result.lon.toStringAsFixed(5)} '
+          '· ground elevation ${result.elevationM.round()} m ASL',
+          style: _labelStyle,
+        ),
+        const SizedBox(height: 12),
+        const Text('Fixed hub heights', style: TextStyle(color: Colors.white, fontWeight: FontWeight.w700, fontSize: 15)),
+        const SizedBox(height: 4),
+        if (result.fixedRequestFailed)
+          const Text('Request failed', style: _errorStyle)
+        else ...[
+          for (final r in result.fixedReadings)
+            Text(
+              '${r.heightAglM} m AGL: '
+              '${r.speedMs != null ? '${r.speedMs!.toStringAsFixed(1)} m/s' : 'n/a'}'
+              '${r.dirFromDeg != null ? ', ${r.dirFromDeg!.round()}°' : ''}',
+              style: _labelStyle,
+            ),
+          Text(
+            'Gusts (10 m AGL): ${result.gustMs != null ? '${result.gustMs!.toStringAsFixed(1)} m/s' : 'n/a'}',
+            style: _labelStyle,
+          ),
+        ],
+        const SizedBox(height: 16),
+        const Text('Pressure levels', style: TextStyle(color: Colors.white, fontWeight: FontWeight.w700, fontSize: 15)),
+        const Text(
+          'discarded if below ground or incomplete',
+          style: TextStyle(color: Colors.white38, fontSize: 12),
+        ),
+        const SizedBox(height: 4),
+        if (result.pressureRequestFailed)
+          const Text('Request failed', style: _errorStyle)
+        else
+          for (final r in result.pressureReadings)
+            Text(
+              '${r.pressureHpa} hPa: '
+              '${r.heightAmslM != null ? '${r.heightAmslM!.round()} m ASL' : '?'}, '
+              '${r.speedMs != null ? '${r.speedMs!.toStringAsFixed(1)} m/s' : 'n/a'}'
+              '${r.excluded ? (r.heightAmslM != null && r.heightAmslM! < result.elevationM ? ' (below ground, excluded)' : ' (incomplete, excluded)') : ''}',
+              style: r.excluded ? _excludedStyle : _labelStyle,
+            ),
+        const SizedBox(height: 16),
+        Container(
+          padding: const EdgeInsets.only(top: 12),
+          decoration: const BoxDecoration(
+            border: Border(top: BorderSide(color: Colors.white24)),
+          ),
+          child: Text(
+            'Interpolated & referenced at 120 m AGL '
+            '(= ${(result.elevationM + 120).round()} m ASL, using pressure levels + fixed heights combined): '
+            '${result.interpolatedAt120 != null ? '${result.interpolatedAt120!.speedMs.toStringAsFixed(1)} m/s, ${result.interpolatedAt120!.dirFromDeg.round()}°' : 'n/a (missing data at boundary level)'}',
+            style: const TextStyle(color: Colors.white, fontWeight: FontWeight.w600, fontSize: 14, height: 1.5),
+          ),
+        ),
+      ],
+    );
+  }
+}
diff --git a/app/test/domain/wind_math_test.dart b/app/test/domain/wind_math_test.dart
new file mode 100644
index 0000000..9402a39
--- /dev/null
+++ b/app/test/domain/wind_math_test.dart
@@ -0,0 +1,116 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:dmc_app/domain/waypoint/flat_waypoint_list.dart';
+import 'package:dmc_app/domain/wind/wind_math.dart';
+
+void main() {
+  group('interpolateAngle', () {
+    test('nimmt den kuerzeren Weg ueber die 0/360-Grenze', () {
+      expect(interpolateAngle(350, 10, 0.5), closeTo(0, 0.001));
+    });
+
+    test('interpoliert linear ohne Grenzuebergang', () {
+      expect(interpolateAngle(10, 30, 0.5), closeTo(20, 0.001));
+    });
+  });
+
+  group('interpolateWindAtHeight', () {
+    const levels = [
+      WindLevel(heightAmslM: 100, speedMs: 4, dirFromDeg: 200),
+      WindLevel(heightAmslM: 300, speedMs: 8, dirFromDeg: 220),
+    ];
+
+    test('klemmt unterhalb des tiefsten Stuetzpunkts', () {
+      final result = interpolateWindAtHeight(levels, 50);
+      expect(result!.speedMs, 4);
+      expect(result.dirFromDeg, 200);
+    });
+
+    test('klemmt oberhalb des hoechsten Stuetzpunkts', () {
+      final result = interpolateWindAtHeight(levels, 500);
+      expect(result!.speedMs, 8);
+      expect(result.dirFromDeg, 220);
+    });
+
+    test('interpoliert linear zwischen zwei Stuetzpunkten', () {
+      final result = interpolateWindAtHeight(levels, 200);
+      expect(result!.speedMs, closeTo(6, 0.001));
+      expect(result.dirFromDeg, closeTo(210, 0.001));
+    });
+
+    test('liefert null ohne Stuetzpunkte', () {
+      expect(interpolateWindAtHeight(const [], 100), isNull);
+    });
+  });
+
+  group('bearingBetweenDeg', () {
+    test('nach Norden ergibt ~0 Grad', () {
+      expect(bearingBetweenDeg(0, 0, 1, 0), closeTo(0, 0.5));
+    });
+
+    test('nach Osten ergibt ~90 Grad', () {
+      expect(bearingBetweenDeg(0, 0, 0, 1), closeTo(90, 0.5));
+    });
+  });
+
+  group('headTailwindComponent', () {
+    test('Wind von hinten ergibt vollen positiven Rueckenwind', () {
+      // Kurs 0 (Nord), Wind weht aus Sueden (180) - also von hinten.
+      expect(headTailwindComponent(0, 10, 180), closeTo(10, 0.001));
+    });
+
+    test('Wind von vorne ergibt vollen negativen Gegenwind', () {
+      // Kurs 0 (Nord), Wind weht aus Norden (0) - also von vorne.
+      expect(headTailwindComponent(0, 10, 0), closeTo(-10, 0.001));
+    });
+
+    test('Seitenwind ergibt ~0 Laengskomponente', () {
+      expect(headTailwindComponent(0, 10, 90), closeTo(0, 0.001));
+    });
+  });
+
+  group('computeLegWindComponent / computeLegWind / computeGroundSpeeds', () {
+    const a = Waypoint(
+      lat: 0,
+      lon: 0,
+      altitudeM: 60,
+      speedMs: 15,
+      catchRadiusM: 60,
+    );
+    const bWithWind = Waypoint(
+      lat: 1,
+      lon: 0,
+      altitudeM: 60,
+      speedMs: 15,
+      catchRadiusM: 60,
+      windSpeedMs: 10,
+      windDirFromDeg: 180,
+    );
+    const bWithoutWind = Waypoint(
+      lat: 1,
+      lon: 0,
+      altitudeM: 60,
+      speedMs: 15,
+      catchRadiusM: 60,
+    );
+
+    test('null solange am Zielwegpunkt kein Wind geladen ist', () {
+      expect(computeLegWindComponent(a, bWithoutWind), isNull);
+    });
+
+    test('Rueckenwind auf dem Leg erhoeht die Bodengeschwindigkeit', () {
+      final component = computeLegWindComponent(a, bWithWind);
+      expect(component, closeTo(10, 0.001));
+
+      final groundSpeeds = computeGroundSpeeds([a, bWithWind]);
+      expect(groundSpeeds.single, closeTo(25, 0.001));
+    });
+
+    test('computeLegWind liefert eine Komponente pro Leg', () {
+      final legWind = computeLegWind([a, bWithWind, bWithoutWind]);
+      expect(legWind, hasLength(2));
+      expect(legWind[0], isNotNull);
+      expect(legWind[1], isNull);
+    });
+  });
+}
diff --git a/app/test/services/wind_service_test.dart b/app/test/services/wind_service_test.dart
new file mode 100644
index 0000000..24d3b0b
--- /dev/null
+++ b/app/test/services/wind_service_test.dart
@@ -0,0 +1,220 @@
+import 'dart:convert';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+
+import 'package:dmc_app/domain/waypoint/flat_waypoint_list.dart';
+import 'package:dmc_app/services/wind/wind_service.dart';
+
+bool _isPressureRequest(http.Request request) =>
+    (request.url.queryParameters['hourly'] ?? '').contains('hPa');
+
+http.Response _json(Object body) =>
+    http.Response(jsonEncode(body), 200, headers: {
+      'content-type': 'application/json',
+    });
+
+void main() {
+  group('WindService.fetchHeaderWind', () {
+    test('interpoliert auf 120 m AGL ueber dem Referenzort', () async {
+      final client = MockClient((request) async {
+        if (_isPressureRequest(request)) {
+          return http.Response('', 500);
+        }
+        return _json({
+          'elevation': 2.0,
+          'hourly': {
+            'time': ['2024-06-01T12:00'],
+            'wind_speed_10m': [3.0],
+            'wind_direction_10m': [190.0],
+            'wind_speed_80m': [5.0],
+            'wind_direction_80m': [200.0],
+            'wind_speed_120m': [6.0],
+            'wind_direction_120m': [205.0],
+            'wind_speed_180m': [8.0],
+            'wind_direction_180m': [210.0],
+            'wind_gusts_10m': [7.5],
+          },
+        });
+      });
+      final service = WindService(client: client);
+
+      final result = await service.fetchHeaderWind(52.0, 4.0);
+
+      // Ziel 2 + 120 = 122 m AMSL faellt exakt auf den 120-m-Stuetzpunkt.
+      expect(result, isNotNull);
+      expect(result!.speedMs, closeTo(6.0, 0.001));
+      expect(result.dirFromDeg, closeTo(205.0, 0.001));
+    });
+
+    test('liefert null, wenn beide Requests fehlschlagen', () async {
+      final client = MockClient((request) async => http.Response('', 500));
+      final service = WindService(client: client);
+
+      final result = await service.fetchHeaderWind(52.0, 4.0);
+
+      expect(result, isNull);
+    });
+  });
+
+  group('WindService.fetchWindForWaypoints', () {
+    test('interpoliert jeden Wegpunkt an seinem eigenen Ort/seiner eigenen Hoehe',
+        () async {
+      final client = MockClient((request) async {
+        if (_isPressureRequest(request)) {
+          return http.Response('', 500);
+        }
+        return _json([
+          {
+            'elevation': 2.0,
+            'hourly': {
+              'time': ['2024-06-01T12:00'],
+              'wind_speed_10m': [3.0],
+              'wind_direction_10m': [190.0],
+              'wind_speed_80m': [5.0],
+              'wind_direction_80m': [200.0],
+              'wind_speed_120m': [6.0],
+              'wind_direction_120m': [205.0],
+              'wind_speed_180m': [8.0],
+              'wind_direction_180m': [210.0],
+              'wind_gusts_10m': [7.5],
+            },
+          },
+          {
+            'elevation': 50.0,
+            'hourly': {
+              'time': ['2024-06-01T12:00'],
+              'wind_speed_10m': [1.0],
+              'wind_direction_10m': [100.0],
+              'wind_speed_80m': [9.0],
+              'wind_direction_80m': [250.0],
+              'wind_speed_120m': [10.0],
+              'wind_direction_120m': [260.0],
+              'wind_speed_180m': [11.0],
+              'wind_direction_180m': [270.0],
+              'wind_gusts_10m': [12.0],
+            },
+          },
+        ]);
+      });
+      final service = WindService(client: client);
+
+      final waypoints = [
+        const Waypoint(
+          lat: 52.0,
+          lon: 4.0,
+          altitudeM: 10, // 2 + 10 = 12 m AMSL: exakt der 10-m-Stuetzpunkt
+          speedMs: 15,
+          catchRadiusM: 60,
+        ),
+        const Waypoint(
+          lat: 52.1,
+          lon: 4.1,
+          altitudeM: 80, // 50 + 80 = 130 m AMSL: exakt der 80-m-Stuetzpunkt
+          speedMs: 15,
+          catchRadiusM: 60,
+        ),
+      ];
+
+      final result = await service.fetchWindForWaypoints(waypoints);
+
+      expect(result[0].windSpeedMs, closeTo(3.0, 0.001));
+      expect(result[0].windDirFromDeg, closeTo(190.0, 0.001));
+      expect(result[0].windElevationM, closeTo(2.0, 0.001));
+
+      expect(result[1].windSpeedMs, closeTo(9.0, 0.001));
+      expect(result[1].windDirFromDeg, closeTo(250.0, 0.001));
+      expect(result[1].windElevationM, closeTo(50.0, 0.001));
+    });
+
+    test('leere Wegpunktliste loest keinen Request aus', () async {
+      var called = false;
+      final client = MockClient((request) async {
+        called = true;
+        return http.Response('', 500);
+      });
+      final service = WindService(client: client);
+
+      final result = await service.fetchWindForWaypoints(const []);
+
+      expect(result, isEmpty);
+      expect(called, isFalse);
+    });
+  });
+
+  group('WindService.fetchValidation', () {
+    test('markiert unvollstaendige/unter Boden liegende Druckflaechen als excluded',
+        () async {
+      final client = MockClient((request) async {
+        if (_isPressureRequest(request)) {
+          return _json({
+            'elevation': 50.0,
+            'hourly': {
+              'time': ['2024-06-01T12:00'],
+              'wind_speed_1000hPa': [4.0],
+              'wind_direction_1000hPa': [300.0],
+              'geopotential_height_1000hPa': [5.0], // unter Bodenhoehe 50
+              'wind_speed_975hPa': [12.0],
+              'wind_direction_975hPa': [300.0],
+              'geopotential_height_975hPa': [800.0],
+            },
+          });
+        }
+        return _json({
+          'elevation': 50.0,
+          'hourly': {
+            'time': ['2024-06-01T12:00'],
+            'wind_speed_10m': [1.0],
+            'wind_direction_10m': [100.0],
+            'wind_speed_80m': [9.0],
+            'wind_direction_80m': [250.0],
+            'wind_speed_120m': [10.0],
+            'wind_direction_120m': [260.0],
+            'wind_speed_180m': [11.0],
+            'wind_direction_180m': [270.0],
+            'wind_gusts_10m': [12.5],
+          },
+        });
+      });
+      final service = WindService(client: client);
+
+      final result = await service.fetchValidation(52.0, 4.0);
+
+      expect(result.elevationM, closeTo(50.0, 0.001));
+      expect(result.fixedRequestFailed, isFalse);
+      expect(result.pressureRequestFailed, isFalse);
+      expect(result.gustMs, closeTo(12.5, 0.001));
+
+      final level1000 =
+          result.pressureReadings.firstWhere((r) => r.pressureHpa == 1000);
+      expect(level1000.excluded, isTrue,
+          reason: 'liegt unter der Bodenhoehe');
+
+      final level975 =
+          result.pressureReadings.firstWhere((r) => r.pressureHpa == 975);
+      expect(level975.excluded, isFalse);
+
+      final level950 =
+          result.pressureReadings.firstWhere((r) => r.pressureHpa == 950);
+      expect(level950.excluded, isTrue,
+          reason: 'keine Daten fuer diese Druckflaeche geliefert');
+
+      expect(result.interpolatedAt120, isNotNull);
+    });
+
+    test('meldet fehlgeschlagenen Request statt zu crashen', () async {
+      final client = MockClient((request) async {
+        if (_isPressureRequest(request)) return http.Response('', 500);
+        return http.Response('', 500);
+      });
+      final service = WindService(client: client);
+
+      final result = await service.fetchValidation(52.0, 4.0);
+
+      expect(result.fixedRequestFailed, isTrue);
+      expect(result.pressureRequestFailed, isTrue);
+      expect(result.interpolatedAt120, isNull);
+    });
+  });
+}