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.


closed as too broad by Brian Carlton, PeterJ, Voltage Spike, DoxyLover, Dmitry Grigoryev Sep 19 '17 at 20:50

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  • \$\begingroup\$ Amateur radio / APRS? Using some encoding methods you can get half way round the world from a 5w walkie talkie, albeit at a few characters a minute. \$\endgroup\$ – John U Feb 20 '15 at 15:39

GPS itself can only receive. If a signal needs to be sent, then there has to be a separate communication sub-system.

A close thing for what you're describing is a product called Spot Locator. It has a satellite modem for Globalstar. Check if they have a variant with an input for an external sensor.

  • \$\begingroup\$ I did run across the Spot when doing my research, I like the concept, but I don't want to use it because it would drive cost through the roof. \$\endgroup\$ – JBoone86 Jul 5 '13 at 22:34
  • \$\begingroup\$ That is about your only option for total coverage. Some places seen to rent them. - en.wikipedia.org/wiki/… \$\endgroup\$ – KalleMP Sep 17 '17 at 16:08

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