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frontend/src/pages/Properties/PropertyDetail.js

@@ -588,6 +588,8 @@ const PropertyDetail = () => {
     setGpsTracePoints([]);
     setGpsDistance(0);
     setGpsAccuracy(null);
+    // Stop passive watch if running (used for Points mode warmup)
+    if (gpsWatchId) { navigator.geolocation.clearWatch(gpsWatchId); setGpsWatchId(null); }
   };
 
   const completeTracing = () => {
@@ -1142,6 +1144,18 @@ const PropertyDetail = () => {
                   if (gpsWatchId) { navigator.geolocation.clearWatch(gpsWatchId); setGpsWatchId(null); }
                   clearGpsPoints();
                   setIsGPSPointsMode(true);
+                  // Start passive GPS watch to warm up accuracy for Points mode
+                  if (navigator.geolocation) {
+                    const id = navigator.geolocation.watchPosition((pos)=>{
+                      const { latitude, longitude, accuracy } = pos.coords;
+                      setGpsAccuracy(accuracy || null);
+                      // Populate smoothing buffer without adding a point yet
+                      try { addSampleAndSmooth(latitude, longitude, accuracy); } catch {}
+                    }, (err)=>{
+                      console.warn('GPS warmup error', err?.message);
+                    }, { enableHighAccuracy: true, maximumAge: 1000, timeout: 15000 });
+                    setGpsWatchId(id);
+                  }
                 }}
               >
                 <div className="font-medium">GPS Points (walk and mark)</div>