Boston Linux & UNIX was originally founded in 1994 as part of The Boston Computer Society. We meet on the third Wednesday of each month at the Massachusetts Institute of Technology, in Building E51.

BLU Discuss list archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss] GPS feature in cellphones?

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.

BLU is a member of BostonUserGroups
BLU is a member of BostonUserGroups
We also thank MIT for the use of their facilities.

Valid HTML 4.01! Valid CSS!

Boston Linux & Unix /