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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.

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

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\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
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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.

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  • \$\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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