diff --git a/libs/feature/record/src/lib/external-viewer-button/external-viewer-button.component.spec.ts b/libs/feature/record/src/lib/external-viewer-button/external-viewer-button.component.spec.ts
index 4a26d8f983..392d419304 100644
--- a/libs/feature/record/src/lib/external-viewer-button/external-viewer-button.component.spec.ts
+++ b/libs/feature/record/src/lib/external-viewer-button/external-viewer-button.component.spec.ts
@@ -89,7 +89,7 @@ describe('ExternalViewerButtonComponent', () => {
         })
         it('opens window in new tab with URL including WMS link params', () => {
           expect(openMock).toHaveBeenCalledWith(
-            'https://example.com/myviewer?url=http%3A%2F%2Fexample.com%2Fows%3Fservice%3Dwms%26request%3Dgetcapabilities&name=layername&type=wms',
+            'https://example.com/myviewer/#/?actions=[{"type":"CATALOG:ADD_LAYERS_FROM_CATALOGS","layers":["layername"],"sources":[{"url":"http%3A%2F%2Fexample.com%2Fows%3Fservice%3Dwms%26request%3Dgetcapabilities","type":"wms"}]}]',
             '_blank'
           )
         })
@@ -138,7 +138,7 @@ describe('ExternalViewerButtonComponent', () => {
         })
         it('opens window in new tab with URL including WFS link params', () => {
           expect(openMock).toHaveBeenCalledWith(
-            'https://example.com/myviewer?url=http%3A%2F%2Fexample.com%2Fows%3Fservice%3Dwfs%26request%3Dgetcapabilities&name=layername&type=wfs',
+            'https://example.com/myviewer/#/?actions=[{"type":"CATALOG:ADD_LAYERS_FROM_CATALOGS","layers":["layername"],"sources":[{"url":"http%3A%2F%2Fexample.com%2Fows%3Fservice%3Dwfs%26request%3Dgetcapabilities","type":"wfs"}]}]',
             '_blank'
           )
         })
@@ -184,7 +184,7 @@ describe('ExternalViewerButtonComponent', () => {
         })
         it('opens window in new tab with URL including link params', () => {
           expect(openMock).toHaveBeenCalledWith(
-            'https://example.com/myviewer?url=http%3A%2F%2Fexample.com%2Fsomespatialdata.geojson&name=externalviewer.dataset.unnamed&type=geojson',
+            'https://example.com/myviewer/#/?actions=[{"type":"CATALOG:ADD_LAYERS_FROM_CATALOGS","layers":["externalviewer.dataset.unnamed"],"sources":[{"url":"http%3A%2F%2Fexample.com%2Fsomespatialdata.geojson","type":"geojson"}]}]',
             '_blank'
           )
         })
diff --git a/libs/util/app-config/src/lib/fixtures.ts b/libs/util/app-config/src/lib/fixtures.ts
index 343595bd67..243a955c65 100644
--- a/libs/util/app-config/src/lib/fixtures.ts
+++ b/libs/util/app-config/src/lib/fixtures.ts
@@ -82,7 +82,7 @@ export const MAP_CONFIG_FIXTURE: MapConfig = {
   MAX_EXTENT: [-418263.418776, 5251529.591305, 961272.067714, 6706890.609855],
   DO_NOT_USE_DEFAULT_BASEMAP: false,
   EXTERNAL_VIEWER_URL_TEMPLATE:
-    'https://example.com/myviewer?url=${service_url}&name=${layer_name}&type=${service_type}',
+    'https://example.com/myviewer/#/?actions=[{"type":"CATALOG:ADD_LAYERS_FROM_CATALOGS","layers":["${layer_name}"],"sources":[{"url":"${service_url}","type":"${service_type}"}]}]',
   EXTERNAL_VIEWER_OPEN_NEW_TAB: true,
   MAP_LAYERS: [
     {