Bill, Do you have a link to that tablet you're using?
Bill, that's quite a detour to come by the shop....you may have to be pretty keen to add that kind of distance to your drive...
Can the Nexus 7 run the GPS app without being connected to a wifi or having a data plan? Similar to say a garmin GPS just connected to a satellite.
I just bought The Samsung tab 3 / 8 it just fits in Horizontally so with a little massaging it will fit with hard wires for power, I email Samsung they told me it will not work with a WiFi camera so I am going to see it it can be done with a USB connection and a splitter out of the Micro USB port.