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[Discuss] GPS feature in cellphones?
- Subject: [Discuss] GPS feature in cellphones?
- From: richard.pieri at gmail.com (Richard Pieri)
- Date: Sat, 07 Jun 2014 14:24:56 -0400
- In-reply-to: <c8b1b60d4922fb8fb23e2f605ced183c.squirrel@webmail.ci.net>
- References: <mailman.73075.1402154227.15487.discuss@blu.org> <c8b1b60d4922fb8fb23e2f605ced183c.squirrel@webmail.ci.net>
Rich Braun wrote: > But anyone > who has ever fiddled with a handheld GPS or wifi-enabled device knows how much > of a power-suck those technologies are. Just because Ed Snowden found a > document that claims otherwise doesn't mean it's true. You're assuming that the GPS receiver in the device has anything to do with it. All that a device needs to do is send a chirp every few minutes. This requires very little power. A single tower can calculate fairly accurate locations from the chirps (Doppler effect); two towers can triangulate precise locations. This is basic radio. There's nothing fancy here. > The average common-crook can get away from the cops by turning off his > cellphone and driving faster/cleverer than they do. Count on it. Maybe by > 2020 that won't be true. One word: Stingray. -- Rich P.
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- [Discuss] GPS feature in cellphones?
- From: richb at pioneer.ci.net (Rich Braun)
- [Discuss] GPS feature in cellphones?
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