Scott,
From your question I take it you are familiar with transferring GPX files to Google My Maps and creating your route there.
If so, you don't have to transfer your route to your android - it's in the cloud.
In order to create a navigation route you first have to open your My Maps route in
Maps>Your Places>Maps in the Google Maps app.
Once your route shows on the screen, zoom in and tap your destination waypoint, then tap
directions. After that, tap inside the bar for starting point and change it to your liking.
Tap the three dots and choose
Add stop to add up to 10 waypoints. During the whole process your My Maps route is showing to guide you to your waypoints. Also, you may drag the stops back and forth to change their order.
After finishing with the 10-stops-max route, tap the three points, send the navigation route to the home screen - and move on to create the next navigation route.
on your home screen you can drag all the navigation route icons together to form a directory.
When you want to navigate, simply tap the route you want to ride - and press
start.[/QUOTE
Was able to install app and access routes. Took a few minutes to get directions to come up. Had to exit the app after installing and reopen. Have not tried adding adding additional waypoints yet (will just use for point-to-point navigation if necessary). I'm a little overwhelmed this weekend with route planning for my first rally; but very thankful for having a back-up process if something doesn't work right with my GPS. Again - thank-you very much!