A Lightbridge P3 doesn't use wifi so there's no need to turn wifi of on the tablet while flying.When I say open your app above, I don't mean while you're trying to fly. Your bird should be off.
Your nexus 7 can't receive two wifi signals at once. The bird should be off and you should connect with an internet signal - that is, a router that's broadcasting internet via wifi.
DJI go did not use Google maps anymore, is using HERE maps.