BMW Connected App?

[Ray]

 I’ll checkout the Garmin smartphone app and learn to plan,export the gpx into the unit and poi waypoints.

There's old instructions on the Rever website on downloading GPX to Garmin Navigators. They have a specific button for downloading GPX to BMW Garmin Navigators that has never worked. 

Rever is pretty good at getting back to folks. You might ask them for current instructions for the NAV VI that might not have made it officially into the Website. You have that great cradle for the NAV VI; might as well use it. Beats most phone mounts.