diff --git a/index.html b/index.html
index da7461b..ef931d3 100644
--- a/index.html
+++ b/index.html
@@ -4541,6 +4541,28 @@
             return this.project(lngLat);
         };
 
+        // =====================
+        // MAPLIBRE MARKER COMPATIBILITY SHIMS
+        // =====================
+        // Add Leaflet-style methods to MapLibre Marker prototype
+
+        // Marker.getLatLng() - returns {lat, lng} object like Leaflet
+        if (!maplibregl.Marker.prototype.getLatLng) {
+            maplibregl.Marker.prototype.getLatLng = function() {
+                const lngLat = this.getLngLat();
+                return { lat: lngLat.lat, lng: lngLat.lng };
+            };
+        }
+
+        // Marker.setLatLng([lat, lng]) - accepts Leaflet-style coordinates
+        if (!maplibregl.Marker.prototype.setLatLng) {
+            maplibregl.Marker.prototype.setLatLng = function(latlng) {
+                const lng = Array.isArray(latlng) ? latlng[1] : latlng.lng;
+                const lat = Array.isArray(latlng) ? latlng[0] : latlng.lat;
+                return this.setLngLat([lng, lat]);
+            };
+        }
+
         // =====================
         // FULL LEAFLET COMPATIBILITY LAYER
         // =====================
@@ -6829,8 +6851,11 @@
 
             // Move once in the specified direction
             const doMove = (dir) => {
+                console.log('doMove called:', dir, 'gpsTestMode:', gpsTestMode);
+
                 // Auto-enable GPS test mode if not already enabled
                 if (!gpsTestMode) {
+                    console.log('Auto-enabling GPS test mode');
                     // Initialize test position to current map center or user location
                     if (userLocation) {
                         testPosition = { lat: userLocation.lat, lng: userLocation.lng };
@@ -6854,6 +6879,16 @@
                     const toggle = document.getElementById('gpsTestModeToggle');
                     if (toggle) toggle.checked = true;
 
+                    // Force auto-center ON when entering test mode
+                    if (!autoCenterMode) {
+                        autoCenterMode = true;
+                        const btn = document.getElementById('autoCenterBtn');
+                        if (btn) {
+                            btn.textContent = 'Auto-Center: ON';
+                            btn.classList.add('active');
+                        }
+                    }
+
                     updateStatus('Test mode enabled via controls', 'info');
                 }
 
@@ -6878,6 +6913,7 @@
 
             // Start moving (on press/touch start)
             const startMove = (e, dir) => {
+                console.log('startMove called:', dir);
                 e.preventDefault();
                 e.stopPropagation();
 
@@ -6892,10 +6928,12 @@
                         doMove(wasdCurrentDir);
                     }
                 }, 100); // Move every 100ms while held
+                console.log('Interval started, wasdMoveInterval:', wasdMoveInterval);
             };
 
             // Stop moving (on release)
             const stopMove = () => {
+                console.log('stopMove called, clearing interval:', wasdMoveInterval);
                 wasdCurrentDir = null;
                 if (wasdMoveInterval) {
                     clearInterval(wasdMoveInterval);
@@ -6909,6 +6947,7 @@
                 let isPressed = false;
 
                 btn.addEventListener('pointerdown', (e) => {
+                    console.log('pointerdown on', dir, 'button');
                     e.preventDefault();
                     e.stopPropagation();
                     isPressed = true;
@@ -6917,6 +6956,7 @@
                 });
 
                 btn.addEventListener('pointerup', (e) => {
+                    console.log('pointerup on', dir, 'button, isPressed:', isPressed);
                     e.preventDefault();
                     e.stopPropagation();
                     if (isPressed) {
@@ -6927,6 +6967,7 @@
                 });
 
                 btn.addEventListener('pointercancel', (e) => {
+                    console.log('pointercancel on', dir, 'button');
                     if (isPressed) {
                         isPressed = false;
                         btn.releasePointerCapture(e.pointerId);
@@ -6936,6 +6977,7 @@
 
                 // Handle lost pointer capture (e.g., when element is hidden)
                 btn.addEventListener('lostpointercapture', (e) => {
+                    console.log('lostpointercapture on', dir, 'button');
                     if (isPressed) {
                         isPressed = false;
                         stopMove();