I use a delorme pn40 for the bike. I'm not quite following, but are you suggesting using a Bluetooth adapter for the delorme that could send information to my ipad? If so what kind of adapter would be compatable?

My simple plan: Use a bad elf chipset to improve GPS accuracy, should get to the 2-3 meter mark. Then for file transfers use my old android phone to email ( hot spot enabled ) the gpx file. I would like to find a card reader that would just upload the gpx file to the ipad ( I'm sure someone makes this ). My major concern is if the bad elf chipset plugged directly into the ipad will work, or if I need to mount something on top of the cab.