It seems like it ought to be possible to do something like LORAN for civilian land navigation applications using cell towers as known-position base stations. That would be much harder to jam, because the power levels would be a lot higher. These guys seem to be working on something like that, using the 2.4GHz ISM band. But as long as they keep it proprietary I don't think it'll get any traction.
posted by Kadin2048 at 9:42 PM on August 27 [1 favorite +] [!]
The Russians have one called GLONASS which they're starting to push for commercial use, and the EU are working on one called Galileo (which South Korea among others are a partner on) that's a long way off completion.
posted by kersplunk at 10:07 PM on August 27 [+] [!]
And China has kind of a weird one called Beidou.
posted by jjwiseman at 10:47 PM on August 27 [+] [!]
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