diff --git a/src/components/map/MapView.tsx b/src/components/map/MapView.tsx
index 49b6469..d5f7e4d 100644
--- a/src/components/map/MapView.tsx
+++ b/src/components/map/MapView.tsx
@@ -24,6 +24,20 @@ const DEFAULT_VIEWPORT: MapViewport = {
   zoom: 15,
 };
 
+// Validate coordinates are within valid ranges
+function isValidCoordinate(lat: number, lng: number): boolean {
+  return (
+    typeof lat === 'number' &&
+    typeof lng === 'number' &&
+    !isNaN(lat) &&
+    !isNaN(lng) &&
+    lat >= -90 &&
+    lat <= 90 &&
+    lng >= -180 &&
+    lng <= 180
+  );
+}
+
 export default function MapView({
   participants,
   waypoints = [],
@@ -45,6 +59,12 @@ export default function MapView({
   useEffect(() => {
     if (!mapContainer.current || map.current) return;
 
+    // Validate viewport center coordinates, fall back to default if invalid
+    const [lng, lat] = initialViewport.center;
+    const validCenter = isValidCoordinate(lat, lng)
+      ? initialViewport.center
+      : DEFAULT_VIEWPORT.center;
+
     map.current = new maplibregl.Map({
       container: mapContainer.current,
       style: {
@@ -73,8 +93,8 @@ export default function MapView({
           },
         ],
       },
-      center: initialViewport.center,
-      zoom: initialViewport.zoom,
+      center: validCenter,
+      zoom: initialViewport.zoom || DEFAULT_VIEWPORT.zoom,
       bearing: initialViewport.bearing ?? 0,
       pitch: initialViewport.pitch ?? 0,
     });
@@ -133,6 +153,12 @@ export default function MapView({
       if (!participant.location) return;
 
       const { latitude, longitude } = participant.location;
+
+      // Skip invalid coordinates
+      if (!isValidCoordinate(latitude, longitude)) {
+        console.warn('Invalid coordinates for participant:', participant.id, latitude, longitude);
+        return;
+      }
       let marker = currentMarkers.get(participant.id);
 
       if (marker) {
@@ -169,12 +195,15 @@ export default function MapView({
     if (autoCenterOnUser && !hasCenteredOnUserRef.current && currentUserId) {
       const currentUser = participants.find(p => p.id === currentUserId);
       if (currentUser?.location && map.current) {
-        console.log('Auto-centering on user location:', currentUser.location.latitude, currentUser.location.longitude);
-        map.current.flyTo({
-          center: [currentUser.location.longitude, currentUser.location.latitude],
-          zoom: 16,
-        });
-        hasCenteredOnUserRef.current = true;
+        const { latitude, longitude } = currentUser.location;
+        if (isValidCoordinate(latitude, longitude)) {
+          console.log('Auto-centering on user location:', latitude, longitude);
+          map.current.flyTo({
+            center: [longitude, latitude],
+            zoom: 16,
+          });
+          hasCenteredOnUserRef.current = true;
+        }
       }
     }
   }, [participants, mapLoaded, currentUserId, onParticipantClick, autoCenterOnUser]);
@@ -197,6 +226,13 @@ export default function MapView({
     // Add/update waypoint markers
     waypoints.forEach((waypoint) => {
       const { latitude, longitude } = waypoint.location;
+
+      // Skip invalid coordinates
+      if (!isValidCoordinate(latitude, longitude)) {
+        console.warn('Invalid coordinates for waypoint:', waypoint.id, latitude, longitude);
+        return;
+      }
+
       let marker = currentWaypointMarkers.get(waypoint.id);
 
       if (marker) {
@@ -271,7 +307,9 @@ export default function MapView({
   const fitToParticipants = () => {
     if (!map.current || participants.length === 0) return;
 
-    const locatedParticipants = participants.filter((p) => p.location);
+    const locatedParticipants = participants.filter(
+      (p) => p.location && isValidCoordinate(p.location.latitude, p.location.longitude)
+    );
     if (locatedParticipants.length === 0) return;
 
     if (locatedParticipants.length === 1) {