APRS Ham radio
Some years ago I played around with something along the same lines with Ham Radio. It was, still is used with a radio transceiver, some hardware ( TNC) and software. It is now possible to get it all in a modern transceiver. It allows world wide coverage including at sea. It basically bounces signals around where ever possible to reach the destination, reporting position etc in as near real time as it is possible depending on connection to other stations. It has facilities for user input messages too. Works like the internet without internet, or with internet. It is essentially free for radio hams. More info here > Google Maps APRS
I haven't messed with it for a very long time, and quite honestly GPRS data tech is much more reliable.
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Regards Tim
Learning my craft for the big stuff, it won't be long now and it's not that far anyway
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