diff --git a/data/gclh_defi.js b/data/gclh_defi.js
index 0d510cca8..b4c07fdf7 100644
--- a/data/gclh_defi.js
+++ b/data/gclh_defi.js
@@ -97,11 +97,11 @@ function layersInit(c) {
         ,"Google Maps" : { tileUrl: "http://mt.google.com/vt?x={x}&y={y}&z={z}",  attribution: "Google Maps",  tileSize: 256,  minZoom: 0,  maxZoom: 20 }
         ,"Google Maps Satellite" : { tileUrl: "http://mt.google.com/vt?lyrs=s&x={x}&y={y}&z={z}",  attribution: "Google Maps",  tileSize: 256,  minZoom: 3,  maxZoom: 20 }
         ,"Google Maps Hybrid" : { tileUrl: "http://mt0.google.com/vt/lyrs=s,m@110&hl=en&x={x}&y={y}&z={z}",  attribution: "Google Maps",  tileSize: 256,  minZoom: 0,  maxZoom: 20 }
+        ,"ÖPNVMap" : { tileUrl: "http://tile.memomaps.de/tilegen/{z}/{x}/{y}.png",  attribution: 'Map <a href="https://memomaps.de">memomaps.de</a> <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Tiles <a href="http://openstreetmap.org/">Openstreetmap</a> <a href="http://opendatacommons.org/licenses/odbl/1.0">ODbL</a>, <a href="https://öpnvkarte.de/#map_key">Legend</a>' }
     };
     c.map_overlays = new Object();
     c.map_overlays = {
          "Hillshadow" : { tileUrl: "http://{s}.tiles.wmflabs.org/hillshading/{z}/{x}/{y}.png",  attribution: 'hillshadow \u00a9 <a href="http://tiles.wmflabs.org/" target=\'_blank\'>tiles.wmflabs.org</a>',  tileSize: 256,  minZoom: 0,  maxZoom: 17 }
-        ,"Public Transport Lines" : { tileUrl: "http://openptmap.org/tiles/{z}/{x}/{y}.png",  attribution: 'Public Transport Lines\u00a9 <a href="http://openptmap.org/" target=\'_blank\'>OpenPTMap</a>',  tileSize: 256,  minZoom: 0,  maxZoom: 17 }
     };
 }
 
diff --git a/gc_little_helper_II.user.js b/gc_little_helper_II.user.js
index adb14ca67..c1c5a701d 100644
--- a/gc_little_helper_II.user.js
+++ b/gc_little_helper_II.user.js
@@ -12045,6 +12045,12 @@ var mainGC = function() {
             settings_secondary_elevation_service = 2
             setValue("migration_task_03", true);
         }
+        // Migrate new map layer ÖPNVMap to the available map layers (zu v0.10.20).
+        if (getValue("migration_task_04", false) != true) {
+            settings_map_layers.push('ÖPNVMap');
+            setValue('settings_map_layers', settings_map_layers.join("###"));
+            setValue("migration_task_04", true);
+        }
     }
 
 // GC/TB Name, GC/TB Link, GC/TB Name Link, preliminary LogDate.