To select or add a Base Map, go to Manage Voyager > Settings > Mapping.
By default, the Base Map is set to the ESRI Street Map, but you can also choose OSGeo Basic WMS.
Click Enable Google Maps to add Google Map Layers:
You can select a layer or click the X next to its name to remove it.
You can also add a map service in the Add Map Service list. Choose from:
You can make ArcGIS Base Maps dynamic by un-selecting Use Cached Tiles when adding it:
To restore the default mapping values, click Restore Map Settings.