I am wondering if I can use my old phone (droid 1) as a sort of in car assistant. The phone is no longer activated so it will be strictly using gps and wifi. I go offroading and want to somehow mount my old phone to the dash and track trails with gps. A lot of trails do not have cell service so i'm not sure how the droids a-gps can handle this? I am also wondering if I can use the gps so see current mph. If this isn't possible then I guess I have another paper weight. Thanks for any insight.