you can use the official verizon ROM and get gps working but I would reccomend using a custom ROM as they don't have all the carrier junk in it. if you flashed to the verizon ROM I think all you need is the coke unlocker 2.31
ftp://up.ppcgeeks.com/Vogue/Users/ImCoKeMaN and followed these directions
http://wiki.xda-developers.com/index...VerizonAGPSFix
but I used 172.25.8.100 for the sever IP instead of verizons (in the registry and in qpst) I had to add this in my registry
[HKEY_LOCAL_MACHINE\Software\HTC\SUPL AGPS]
"EnablePDEIPFromNV"=dword:00000001
and I changed the GPSMode to 4. you can use 1-2 or 4 but I found that 4 had a faster lock.
and I changed ServerIP in the registry to the one above I didn't use any cab file to change the registry I found it easier
to go in and change it myself. you can experiment with these setting until you the the desired results
I downloaded and installed lllboredlll_VZW_GPS_Fix_v2 cab and had to go into windows and run ppst.exe and followed the directions. then I downloaded GPStoggle which is a nice today plugin that you can turn your GPS on or off for the programs that cant prime like Igo8. after this you might or might not have to call verizon so they can authenticate your phone just tell them you had to hard reset.
go here to get the 2 above programs
http://forum.ppcgeeks.com/showthread.php?t=53561&page=2