Is there a way to send GPS coordinates from one device to another, without the use of any kind of cell service?
What I'm attempting to design is a device that connect to a motorcycles' tip-over sensor, that can send some sort of SOS message to a pre-determined contact (phone number, email address, web server, etc) in the event of a crash. The problem is that often times, the places we motorcyclists ride is not within cell reception. I've found a lot of information on how to build GPS tracking devices, but they seem to all require an internet connection or cell service. So it'll have to be a satellite transmission of some sort, I think.