Originally Posted by sandalscout
I have the same/similar issue, except my drain time is about 3 hours. I believe that my phone is charging, but the GPS draw rate is significantly more than the charge rate, so eventually it just kills the phone.
That is sort of exciting news to me. I didn't think I could convince myself to learn embedded programming and GPS design but if the phone can't stay charged with .5A coming with the GPS antenna running then I may have to. The first thing I'll do though is shut off the microwave triangulation stuff and see what the power draw is like. You can do this as well just by putting the phone in Airplane mode. At least where I ride I don't have any cell coverage anyway. My apps solution (if I can find one) will be more convenient than that.