Re: Radio modem???
It is possible that he was an amateur radio operator using packet radio. It is a long shot, but you never know. A friend of mine built a PC into his car an it uses packet radio for (slow) internet access. It is too slow to do anything other than transmit his vehicle's coordinates to a web site so that he can track it from the internet. (Other vehicles using the same software can also view his location, if he allows it. Obviously, you do not see many other vehicles on the map, as this software is not used much.) It is still neat, though, and it might have been what the person in question was using.
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