[extropy-chat] PRIVACY: GPS darts

Dan Clemmensen dgc at cox.net
Tue Apr 20 20:50:06 UTC 2004

I knew it was a spoof before I looked at the page, based on the antenna 
and the power requirement. If I want to use high tech to tag and track 
someone, this is not the way I would do it.

On the antenna size: There is a reason an RFID tag is 2cmX5cm.
On power: there is a reason an RFID tag can only be scanned from within 
a few feet at most.

Mike Lorrey wrote:

>Yes, the picture of the rifle looks like a comic book writers fetish.
>However, my point of posting this is that any tech realistic enough to
>spoof well is close enough to the edge of current day tech reality that
>it is just around the corner. If he had done the gun design better he
>might have spoofed more people.
>That he received such an enthusiastic audience in China for the concept
>he was spoofing is pretty indicative of where things are headed.
>while radio requires at least a few centimeters, a real GPS dart could
>easily penetrate more than a few centimeters, trailing a flexible
>antenna. The GPS chip itself is getting smaller  and smaller, and can
>easily be powered by a coil drawing on ambient radio noise.
>--- Dan Clemmensen <dgc at cox.net> wrote:
>>This has to be a spoof.
>>   -- The picture of the rifle itself looks bogus.
>>   -- The picture of the chip and its capsule shows a unit that is
>>far too large to be implanted with only "mosquito-like" consequences.
>>   -- Such a device would need both a GPS receiver and some sort of 
>>transmitter. It the transmitter cannot reach more than (say) 50 feet,
>>then GPS is irrelevant: you can just triangulate on the transmitter.
>>   -- Micro-scale devices cannot in general transmit or receive radio
>>waves. You need an antenna of the correct size, and that size is at 
>>least a few centimeters.

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