Three minor points:
1. There are two categories of IPAD. One is wifi only and one has wifi and cellular.
The wifi only model does not have the built-in gps
You need to get the cellular model.
You do not need to purchase the cellular plan as the gps
chip will still work but you do need the cellular model or you have to purchase a separate plug-in compatible gps
dongle for the wifi only unit.
2. The ability to see in bright sunlight is an issue for most of us.
3. The battery will run down very quickly so you need a charging source.