This is the exact reason why i gave up on my earthmate. Plus the guy that gave it to me had 4 batteries that had leaked acid on the board. I cleaned up the board as good as i could, but i think the unit is completely dead. I tried it with my computer once, but i didn't have any software, so i couldn't really test it. Plus by that time, i had already sourced another gps unit that worked perfectly. I still have the earthmate, its in my glovebox i think. If you can get to the bottom of these issues, I would love to give my earthmate another try, or if maybe someone has a link to some free gps software I could test it with on my pc, that would also get great