diff --git a/frontend/app/gallery/map/lightbox/lightbox.map.gallery.component.ts b/frontend/app/gallery/map/lightbox/lightbox.map.gallery.component.ts
index 73e67b97..5a98dcf5 100644
--- a/frontend/app/gallery/map/lightbox/lightbox.map.gallery.component.ts
+++ b/frontend/app/gallery/map/lightbox/lightbox.map.gallery.component.ts
@@ -154,27 +154,12 @@ export class GalleryMapLightboxComponent implements OnChanges, AfterViewInit {
 
   }
 
-  private calcDistance(loc: MapPath, loc2: MapPath): number {
-    const radlat1 = Math.PI * loc.latitude / 180;
-    const radlat2 = Math.PI * loc2.latitude / 180;
-    const theta = loc.longitude - loc2.longitude;
-    const radtheta = Math.PI * theta / 180;
-    let dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
-    if (dist > 1) {
-      dist = 1;
-    }
-    dist = Math.acos(dist);
-    dist = dist * 180 / Math.PI;
-    dist = dist * 60 * 1.1515;
-    return dist * 1.609344;
-  }
-
 
   private gpxFilter(list: MapPath[]) {
     let last = list[0];
     const out = [];
     for (let i = 1; i < list.length; i++) {
-      if (this.calcDistance(list[i], last) > 0.5) {
+      if (this.mapService.calcDistance(list[i], last) > 0.5) {
         out.push(list[i]);
         last = list[i];
       }
diff --git a/frontend/app/gallery/map/map.service.ts b/frontend/app/gallery/map/map.service.ts
index 8ba6f4a4..fada51dc 100644
--- a/frontend/app/gallery/map/map.service.ts
+++ b/frontend/app/gallery/map/map.service.ts
@@ -11,6 +11,21 @@ export class MapService {
   }
 
 
+  public calcDistance(loc: MapPath, loc2: MapPath): number {
+    const radlat1 = Math.PI * loc.latitude / 180;
+    const radlat2 = Math.PI * loc2.latitude / 180;
+    const theta = loc.longitude - loc2.longitude;
+    const radtheta = Math.PI * theta / 180;
+    let dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
+    if (dist > 1) {
+      dist = 1;
+    }
+    dist = Math.acos(dist);
+    dist = dist * 180 / Math.PI;
+    dist = dist * 60 * 1.1515;
+    return dist * 1.609344;
+  }
+
   public async getMapPath(file: FileDTO): Promise<MapPath[]> {
     const filePath = Utils.concatUrls(file.directory.path, file.directory.name, file.name);
     const gpx = await this.networkService.getXML('/gallery/content/' + filePath);