Joined: Jul 2007
Posts: 8,597
Likes: 3,528
From: South shore, L.I., NY
Bikes: Trek Emonda SL7, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo
Not seeing how you are going to get the Garmin to be read as a drive by the Galaxy.
An alternative is to not use RWGPS but instead use Garmin Connect. The maps are OpenStreetMaps OR Google, so essentially the same as RWGPS. I find building "courses" (Routes in RWGPS speak) to be as easy in Connect as RWGPS.
Then use the Connect app on the tablet or a smartphone to BT sync the Connect route to the 810.