That stock rom wont work with GPS radio. You need a non-stock rom for it to work.
Get this rom(this is the one I use, you can use others like No2Chem's which is equally as good):
http://forum.xda-developers.com/showthread.php?t=402920
Get this radio:
http://forum.xda-developers.com/showthread.php?t=403280
use this as a guide:
http://wiki.xda-developers.com/index...itanRecentHome
Once the rom is installed assuming you have verizon, run the carrier cab.
Get carrier cab here:
http://www.lifesnotsogood.com/dcd1182/carriers/dcd%20Verizon%20Carrier%2020080706.cab
Remember you will need to install the new boot loader first. Then do the rest according to instructions there.
Also, make sure you have another phone handy or a land-line handy for when u call verizon. To get it re-authenticated. You will need to do this whenever u go from a non-gps radio to a gps one. (I reccomend doing this during business hours so u dont freak and wont be able to contact them until they open in the morning)