If I'm in an area where I have no wifi or gps on my tablet, why would I have a use for offline maps?  I'm trying to understand the benifit in using them.

Hi, you need to know your position from the offline maps. Please download the offline maps or follow the steps below to cache the maps on your device before the flight:
Connect your device to the Internet, open DJI GO4, go to the flying location on the map, zoom into the desired zoom level, scroll around on the map to load the map images in all areas where you want to fly.

Yeah, you can cache the maps at home - they are used to help navigate the drone in terms of orientating it's position.

Thank you.  I'll give it a try.

Chuck