I run a FTM-350, so I have the GPS and modem built-in to run on the background side. Some run a second radio for APRS, but I was having issues with it interfering with my main radio and needed some way to duplex them. It was easier just to sell both radios and replace them with one.
No help on the Android stuff, I run an old Nokia flip phone that doesn't seem to give a rat's rear what my ham radios are doing. I did interface an old Garmin Nuvi 350 to my radio. It displays received station positions as favorites and landmarks. Other stations pop up on the GPS map and I can use them as waypoint to navigate.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna