Ray how in the world could you have any compatibility problems with G*,we have two units that we share between four tractors and a combine,it is pretty elementary stuff. Just a matter of a couple minutes to make a switch.

I demoed a GS2 for a couple days this week in the combine,nice unit but if all I was doing was mapping it would be a waste of money.

 The little color screen would be of more value if it were a DVD player or a mini TV.