Using Vogue as GPS navigator without plan.

[KhMeRA]

Hi everyone! actually I don't want to create a new thread but I been searching around for long time and couldn't find the solution. Here is my question. I got 2 vogues, one subscribe with Sprint and everthing works fine and another one is an extra. I would like to use the extra phone just for GPS navigation but I got very low GPS reception if I compare it too my other Vogue with plan and plus, with this extra phone, I only get the GPS locked onece and then I've never get it lock again. Doe anyone know what is the resistry setting to get a better GPS reception? or which ROM to flash? Thanks