Sometimes they forget what it was like to be brand new. I hesitate every time I get ready to post for fear I'll get my hand smacked, but you have to understand how hard the experts work to keep our geeky desires satisfied. Honestly, there are a ton of posts around about enabling the GPSr on the Alltel 6800. Anyway, try the link below. I used it and mine works perfectly. You should check and make sure that you have the latest ROM (3.56) before you jump into this.
Good Luck.
http://forum.ppcgeeks.com/showthread.php?t=36377