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A comment on GPS tracking device found on an activist's car. Parent comment

Re:GPS tracking device found on an activist's car by throwawayaway on Friday March 06, 2015 @07:19PM (#9160400)
i guess all the downvotes mean gps transponders won't be built in then!

that's how it works isn't it?

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Re:GPS tracking device found on an activist's car by dingaling on Saturday March 07, 2015 @12:57AM (#9161161)
What do you mean by "GPS transponders"?

A transponder replies to an interrogation with a squitter response.

Navstar satellites zip along merrily broadcasting to anyone who will listen ( regardless of the receiver's ability to process the signal ). You as an intending user don't communicate with them at all.

In the receiver there is no transmission capability related to GPS. Why would there be? The only uplink to which Navstar sats will listen is that from Boeing's system control center ( or presumably a spoof thereof ).

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