diff --git a/station_map_www.js b/station_map_www.js
index 6437321..7d50bac 100644
--- a/station_map_www.js
+++ b/station_map_www.js
@@ -72,9 +72,9 @@ function init(showGoogle, showStations, showQuakes, noFrils) {
 	var osmde_map_layer = new OpenLayers.Layer.OSM(
 		'OpenStreetMap (DE)',
 		[
-			"http://a.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png",
-			"http://b.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png",
-			"http://c.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png"
+			"https://a.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png",
+			"https://b.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png",
+			"https://c.tile.openstreetmap.de/tiles/osmde/${z}/${x}/${y}.png"
 		],
 		{
 			attribution: 'Geobasisdaten: Copyright &copy; 2013 <a href="http://www.openstreetmap.org/">OpenStreetMap</a> und Mitwirkende;'  +
@@ -113,6 +113,18 @@ function init(showGoogle, showStations, showQuakes, noFrils) {
 		]);
 	};
 
+	// ESRI
+	var esri_map_layer = new OpenLayers.Layer.XYZ(
+		'ESRI',
+		"https://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/${z}/${y}/${x}",
+		{
+			sphericalMercator: true,
+			attribution: 'Copyright &copy; 2013 by ESRI. ' +
+				'This work is licensed under the Web Services and API <a href="http://links.esri.com/agol_tou" target="_blank">Terms of Use</a>.'
+		}
+	);
+	map.addLayers([esri_map_layer]);
+	
 	// Show quakes
 	quakes_layer = loadKML(OpenLayers.i18n("Events"), 'quakes.kml', false, true);
 	map.addLayer(quakes_layer);