My five hunting partners and I use Magellan 315 units and are more than well pleased.

If I were you I'd check into different varieties and pick the one that comes closest to meeting your needs; obviously I wound recommend the Magellan 315 GPS.

I am also a licensed pilot and if I were to give any specific advice regarding the use of the GPS it would be to use it until it becomes automatic. But most of all . . . Learn To Trust It . . . you'll not be sorry.

Bowhunter