client/src/components/LiveLogView.tsx

@@ -73,6 +73,7 @@ import {
   type GeolocationErrorReason,
   type GpsSignalQuality
 } from '../utils/geolocation.js'
+import { formatCourseAngle } from '../utils/courseAngle.js'
 import { sortLogEventsByTime, type LogEventPayload } from '../utils/logEntryPayload.js'
 import {
   dedupeSailNames,
@@ -633,16 +634,18 @@ export default function LiveLogView({
     setModal(type)
   }
 
+  const liveLogGpsPrefillOptions = {
+    timeoutMs: 8000,
+    enableHighAccuracy: false,
+    maximumAge: 60_000
+  } as const
+
   const openSogModal = async () => {
     let prefill = ''
     try {
       const permission = await queryGeolocationPermission()
       if (permission === 'granted') {
-        const pos = await getCurrentPosition({
-          timeoutMs: 8000,
-          enableHighAccuracy: false,
-          maximumAge: 60_000
-        })
+        const pos = await getCurrentPosition(liveLogGpsPrefillOptions)
         if (pos.speedKn != null) prefill = String(pos.speedKn)
       }
     } catch {
@@ -651,6 +654,20 @@ export default function LiveLogView({
     openValueModal('sog', prefill)
   }
 
+  const openCourseModal = async () => {
+    let prefill = lastCourseFromEvents(events)
+    try {
+      const permission = await queryGeolocationPermission()
+      if (permission === 'granted') {
+        const pos = await getCurrentPosition(liveLogGpsPrefillOptions)
+        if (pos.headingDeg != null) prefill = formatCourseAngle(pos.headingDeg, true)
+      }
+    } catch {
+      // Fall back to last logged course or manual entry
+    }
+    openValueModal('course', prefill)
+  }
+
   const handleMotorToggle = () => {
     hapticPulse()
     const starting = !motorRunning
@@ -1433,7 +1450,7 @@ export default function LiveLogView({
           onCastOff={handleCastOff}
           onMoor={handleMoor}
           onOpenSails={() => { setSelectedSails([]); setModal('sails') }}
-          onOpenCourse={() => openValueModal('course', lastCourseFromEvents(events))}
+          onOpenCourse={() => void openCourseModal()}
           onOpenSog={() => void openSogModal()}
           onOpenStw={() => openValueModal('stw')}
           onOpenFuel={() => openValueModal('fuel')}
@@ -1796,6 +1813,7 @@ export default function LiveLogView({
         <div className="live-log-modal-backdrop" onClick={() => setModal('none')}>
           <div className="live-log-modal live-log-modal--dial" onClick={(e) => e.stopPropagation()}>
             <h3>{t('logs.live_course_btn')}</h3>
+            <p className="live-log-modal-hint">{t('logs.live_course_hint')}</p>
             <div className="live-log-dial-field">
               <label>{t('logs.event_mgk')}</label>
               <CourseDialInput

client/src/i18n/locales/da.json

@@ -389,6 +389,7 @@
       "live_sog_placeholder": "f.eks. 5,2",
       "live_stw_placeholder": "f.eks. 4,8",
       "live_sog_hint": "Afstand over jordoverfladen (kn) — GPS-værdien udfyldes automatisk, hvis den er tilgængelig.",
+      "live_course_hint": "Kurs over jord (°) — GPS-værdien udfyldes automatisk, hvis den er tilgængelig.",
       "delete_entry": "Slet dag",
       "delete_confirm": "Er du sikker på, at du vil slette denne rejsedag endeligt?",
       "carry_over_tanks_title": "Skal data fra i går overføres?",

client/src/i18n/locales/de.json

@@ -395,6 +395,7 @@
       "live_sog_placeholder": "z. B. 5,2",
       "live_stw_placeholder": "z. B. 4,8",
       "live_sog_hint": "Fahrt über Grund (kn) — GPS-Wert wird vorgefüllt, wenn verfügbar.",
+      "live_course_hint": "Kurs über Grund (°) — GPS-Wert wird vorgefüllt, wenn verfügbar.",
       "delete_entry": "Tag löschen",
       "delete_confirm": "Bist du sicher, dass du diesen Reisetag unwiderruflich löschen möchtest?",
       "carry_over_tanks_title": "Daten vom Vortag übernehmen?",

client/src/i18n/locales/en.json

@@ -395,6 +395,7 @@
       "live_sog_placeholder": "e.g. 5.2",
       "live_stw_placeholder": "e.g. 4.8",
       "live_sog_hint": "Speed over ground (kn) — prefilled from GPS when available.",
+      "live_course_hint": "Course over ground (°) — prefilled from GPS when available.",
       "delete_entry": "Delete Day",
       "delete_confirm": "Are you sure you want to permanently delete this travel day?",
       "carry_over_tanks_title": "Carry over from previous day?",

client/src/i18n/locales/es.json

@@ -389,6 +389,7 @@
       "live_sog_placeholder": "p. ej., 5,2",
       "live_stw_placeholder": "p. ej., 4,8",
       "live_sog_hint": "Distancia recorrida (km) — El valor del GPS se rellena automáticamente si está disponible.",
+      "live_course_hint": "Rumbo sobre el fondo (°) — El valor del GPS se rellena automáticamente si está disponible.",
       "delete_entry": "Eliminar etiqueta",
       "delete_confirm": "¿Estás seguro de que quieres eliminar definitivamente este día de viaje?",
       "carry_over_tanks_title": "¿Importar los datos del día anterior?",

client/src/i18n/locales/fr.json

@@ -389,6 +389,7 @@
       "live_sog_placeholder": "par exemple 5,2",
       "live_stw_placeholder": "par exemple 4,8",
       "live_sog_hint": "Vitesse par rapport au sol (kn) — La valeur GPS est préremplie si elle est disponible.",
+      "live_course_hint": "Cap sur le fond (°) — La valeur GPS est préremplie si elle est disponible.",
       "delete_entry": "Supprimer la balise",
       "delete_confirm": "Es-tu sûr de vouloir supprimer définitivement cette date de voyage ?",
       "carry_over_tanks_title": "Reprendre les données de la veille ?",

client/src/i18n/locales/nb.json

@@ -389,6 +389,7 @@
       "live_sog_placeholder": "f.eks. 5,2",
       "live_stw_placeholder": "f.eks. 4,8",
       "live_sog_hint": "Fart over grunn (kn) — GPS-verdien fylles ut automatisk hvis den er tilgjengelig.",
+      "live_course_hint": "Kurs over grunn (°) — GPS-verdien fylles ut automatisk hvis den er tilgjengelig.",
       "delete_entry": "Slett dag",
       "delete_confirm": "Er du sikker på at du vil slette denne reisedagen uten mulighet for å angre?",
       "carry_over_tanks_title": "Skal data fra i går overføres?",

client/src/i18n/locales/sv.json

@@ -389,6 +389,7 @@
       "live_sog_placeholder": "t.ex. 5,2",
       "live_stw_placeholder": "t.ex. 4,8",
       "live_sog_hint": "Avstånd över marken (kn) — GPS-värdet fylls i automatiskt om det finns tillgängligt.",
+      "live_course_hint": "Kurs över mark (°) — GPS-värdet fylls i automatiskt om det finns tillgängligt.",
       "delete_entry": "Ta bort dag",
       "delete_confirm": "Är du säker på att du vill radera den här resedagen utan möjlighet att ångra dig?",
       "carry_over_tanks_title": "Överföra data från föregående dag?",

client/src/utils/geolocation.test.ts

@@ -77,11 +77,29 @@ describe('geolocation helpers', () => {
       lat: '59.910000',
       lng: '10.750000',
       speedKn: 4.9,
+      headingDeg: null,
       accuracyM: 12,
       signalQuality: 'excellent'
     })
   })
 
+  it('resolves heading from getCurrentPosition when reported', async () => {
+    vi.stubGlobal('navigator', {
+      geolocation: {
+        getCurrentPosition: (success: PositionCallback) => {
+          success({
+            coords: { latitude: 59.91, longitude: 10.75, heading: 245.6, accuracy: 8 }
+          } as GeolocationPosition)
+        }
+      }
+    })
+
+    await expect(getCurrentPosition({ timeoutMs: 1000, enableHighAccuracy: false })).resolves.toMatchObject({
+      headingDeg: 246,
+      signalQuality: 'excellent'
+    })
+  })
+
   it('formats GPS accuracy for display', () => {
     expect(formatGpsAccuracyMeters(12.4)).toBe('12')
     expect(formatGpsAccuracyMeters(87)).toBe('87')

client/src/utils/geolocation.ts

@@ -18,6 +18,8 @@ export interface GeoCoordinates {
   lng: string
   /** SOG from GPS when available (kn), otherwise null. */
   speedKn: number | null
+  /** COG from GPS when available (degrees, 0–359), otherwise null. */
+  headingDeg: number | null
   /** Estimated horizontal accuracy in metres, when reported by the browser. */
   accuracyM: number | null
   /** Derived signal quality indicator for UI hints. */
@@ -142,10 +144,16 @@ function normalizeGetPositionOptions(
   }
 }
 
+function normalizeHeadingDeg(heading: number | null | undefined): number | null {
+  if (heading == null || !Number.isFinite(heading)) return null
+  return Math.round(((heading % 360) + 360) % 360)
+}
+
 function positionFromGeolocationPosition(pos: GeolocationPosition): GeoCoordinates {
   const speedKn = pos.coords.speed != null && Number.isFinite(pos.coords.speed)
     ? Number((pos.coords.speed * MPS_TO_KNOTS).toFixed(1))
     : null
+  const headingDeg = normalizeHeadingDeg(pos.coords.heading)
   const accuracyM = pos.coords.accuracy != null && Number.isFinite(pos.coords.accuracy)
     ? pos.coords.accuracy
     : null
@@ -153,6 +161,7 @@ function positionFromGeolocationPosition(pos: GeolocationPosition): GeoCoordinat
     lat: formatAppCoordinate(pos.coords.latitude),
     lng: formatAppCoordinate(pos.coords.longitude),
     speedKn,
+    headingDeg,
     accuracyM,
     signalQuality: classifyGpsAccuracyMeters(accuracyM)
   }