diff --git a/lib/dev_config.dart b/lib/dev_config.dart
index 18adfd8..70d53b1 100644
--- a/lib/dev_config.dart
+++ b/lib/dev_config.dart
@@ -6,6 +6,11 @@ import 'package:flutter/material.dart';
 // Fallback tile storage estimate (KB per tile), used when no preview tile data is available
 const double kFallbackTileEstimateKb = 25.0;
 
+// Preview tile coordinates for tile provider previews and size estimates
+const int kPreviewTileZoom = 18;
+const int kPreviewTileY = 101300;
+const int kPreviewTileX = 41904;
+
 // Direction cone for map view
 const double kDirectionConeHalfAngle = 30.0; // degrees
 const double kDirectionConeBaseLength = 0.001; // multiplier
diff --git a/lib/screens/tile_provider_editor_screen.dart b/lib/screens/tile_provider_editor_screen.dart
index dbaa03c..a3fb243 100644
--- a/lib/screens/tile_provider_editor_screen.dart
+++ b/lib/screens/tile_provider_editor_screen.dart
@@ -7,6 +7,7 @@ import 'package:collection/collection.dart';
 import '../app_state.dart';
 import '../models/tile_provider.dart';
 import '../services/localization_service.dart';
+import '../dev_config.dart';
 
 class TileProviderEditorScreen extends StatefulWidget {
   final TileProvider? provider; // null for adding new provider
@@ -378,11 +379,11 @@ class _TileTypeDialogState extends State<_TileTypeDialog> {
     });
 
     try {
-      // Use a sample tile (zoom 10, somewhere in the world)
+      // Use a sample tile from configured preview location
       final url = _urlController.text
-          .replaceAll('{z}', '10')
-          .replaceAll('{x}', '512')
-          .replaceAll('{y}', '384');
+          .replaceAll('{z}', kPreviewTileZoom.toString())
+          .replaceAll('{x}', kPreviewTileX.toString())
+          .replaceAll('{y}', kPreviewTileY.toString());
       
       final response = await http.get(Uri.parse(url));
       
diff --git a/lib/services/tile_preview_service.dart b/lib/services/tile_preview_service.dart
index 5260c3f..91d3b68 100644
--- a/lib/services/tile_preview_service.dart
+++ b/lib/services/tile_preview_service.dart
@@ -4,12 +4,10 @@ import 'package:http/http.dart' as http;
 
 import '../models/tile_provider.dart';
 import '../state/settings_state.dart';
+import '../dev_config.dart';
 
 /// Service for fetching missing tile preview images
 class TilePreviewService {
-  static const int _previewZoom = 10;
-  static const int _previewX = 512;
-  static const int _previewY = 384;
   static const Duration _timeout = Duration(seconds: 10);
 
   /// Attempt to fetch missing preview tiles for tile types that don't already have preview data
@@ -63,7 +61,7 @@ class TilePreviewService {
 
   static Future<Uint8List?> _fetchPreviewForTileType(TileType tileType, String? apiKey) async {
     try {
-      final url = tileType.getTileUrl(_previewZoom, _previewX, _previewY, apiKey: apiKey);
+      final url = tileType.getTileUrl(kPreviewTileZoom, kPreviewTileX, kPreviewTileY, apiKey: apiKey);
       
       final response = await http.get(Uri.parse(url)).timeout(_timeout);