diff --git a/html/defaults.js b/html/defaults.js
index c716af1..ee507cf 100644
--- a/html/defaults.js
+++ b/html/defaults.js
@@ -79,6 +79,7 @@ let openAIPOpacity = 0.70;
 let tfrOpacity = 0.70;
 
 let offlineMapDetail = -1;
+let offlineMapDetailOFM = -1;
 
 // -- Marker settings -------------------------------------
 // (marker == aircraft icon)
diff --git a/html/layers.js b/html/layers.js
index 9988390..1a9027a 100644
--- a/html/layers.js
+++ b/html/layers.js
@@ -99,6 +99,22 @@ function createBaseLayers() {
         type: 'base',
     }));
 
+    if (offlineMapDetailOFM > 0) {
+        world.push(new ol.layer.VectorTile({
+            type: 'base',
+            name: 'OpenFreeMapOffline',
+            title: 'OpenFreeMap Offline',
+            declutter: true,
+            onVisible: (layer) => {
+                if (!layer.get('styleApplied')) {
+                    // ol-mapbox-style plugin packed in with ol ... (kinda ugly)
+                    ol.mapboxStyle.applyStyle(layer, "./openfreemap_tiles_offline/liberty");
+                    ol.mapboxStyle.applyBackground(layer, "./openfreemap_tiles_offline/liberty");
+                    layer.set('styleApplied', true);
+                }
+            },
+        }));
+    }
     if (1) {
         world.push(new ol.layer.VectorTile({
             type: 'base',
diff --git a/install.sh b/install.sh
index 40fb6bf..81436ac 100755
--- a/install.sh
+++ b/install.sh
@@ -308,16 +308,27 @@ do
 
     # in case we have offlinemaps installed, modify config.js
     MAX_OFFLINE=""
+    MAX_OFFLINE_OFM=""
     for i in {0..15}; do
+        if [[ -d /usr/local/share/openfreemap_offline/mnt/tiles/$i ]]; then
+            MAX_OFFLINE_OFM=$i
+        fi
         if [[ -d /usr/local/share/osm_tiles_offline/$i ]]; then
             MAX_OFFLINE=$i
         fi
     done
     if [[ -n "$MAX_OFFLINE" ]]; then
-        if ! grep "$TMP/config.js" -e '^offlineMapDetail.*' -qs &>/dev/null; then
+        if ! grep "$TMP/config.js" -E -e '^offlineMapDetail\s*=.*' -qs; then
             echo "offlineMapDetail=$MAX_OFFLINE;" >> "$TMP/config.js"
         else
-            sed -i -e "s/^offlineMapDetail.*/offlineMapDetail=$MAX_OFFLINE;/" "$TMP/config.js"
+            sed -i -e "s/^offlineMapDetail\s*=.*/offlineMapDetail=$MAX_OFFLINE;/" "$TMP/config.js"
+        fi
+    fi
+    if [[ -n "$MAX_OFFLINE_OFM" ]]; then
+        if ! grep "$TMP/config.js" -E -e '^offlineMapDetailOFM\s*=.*' -qs; then
+            echo "offlineMapDetailOFM=$MAX_OFFLINE_OFM;" >> "$TMP/config.js"
+        else
+            sed -i -e "s/^offlineMapDetailOFM\s=.*/offlineMapDetailOFM=$MAX_OFFLINE_OFM;/" "$TMP/config.js"
         fi
     fi