Add Navigation Arrow and simplify static page

public/js/geolocation.js

@@ -1,18 +1,61 @@
 (function (ns) {
   'use strict';
+
   let watchId = null;
-  function normalize(position) { return { lat: position.coords.latitude, lon: position.coords.longitude, accuracy: position.coords.accuracy, timestamp: position.timestamp }; }
+
+  function normalize(position) {
+    return {
+      lat: position.coords.latitude,
+      lon: position.coords.longitude,
+      accuracy: position.coords.accuracy,
+      altitude: position.coords.altitude,
+      heading: position.coords.heading,
+      speed: position.coords.speed,
+      timestamp: position.timestamp
+    };
+  }
+
   ns.Geo = {
     current() {
       return new Promise((resolve, reject) => {
-        if (!navigator.geolocation) return reject(new Error('Dieses Gerät unterstützt keine Geolokalisierung.'));
-        navigator.geolocation.getCurrentPosition(p => resolve(normalize(p)), reject, { enableHighAccuracy: true, timeout: ns.Config.geolocationTimeoutMs, maximumAge: 30000 });
+        if (!navigator.geolocation) {
+          reject(new Error('Dieses Gerät unterstützt keine Geolokalisierung.'));
+          return;
+        }
+
+        navigator.geolocation.getCurrentPosition(
+          position => resolve(normalize(position)),
+          reject,
+          {
+            enableHighAccuracy: true,
+            timeout: ns.Config.geolocationTimeoutMs,
+            maximumAge: 30000
+          }
+        );
       });
     },
+
     start(callback, onError) {
       this.stop();
-      watchId = navigator.geolocation.watchPosition(p => callback(normalize(p)), onError, { enableHighAccuracy: true, timeout: 20000, maximumAge: 5000 });
+      if (!navigator.geolocation) {
+        onError?.(new Error('Dieses Gerät unterstützt keine Geolokalisierung.'));
+        return;
+      }
+
+      watchId = navigator.geolocation.watchPosition(
+        position => callback(normalize(position)),
+        onError,
+        {
+          enableHighAccuracy: true,
+          timeout: 20000,
+          maximumAge: 5000
+        }
+      );
     },
-    stop() { if (watchId != null) navigator.geolocation.clearWatch(watchId); watchId = null; }
+
+    stop() {
+      if (watchId != null) navigator.geolocation.clearWatch(watchId);
+      watchId = null;
+    }
   };
 }(window.Wegwichtel));