

@BamaBob
The device knows where it is, but only that device. GPS is essentially a one-way system (as far as non-military use is concerned) wherein a device receives information from satellites and calculates its position.
Like DEW26M said, in order to know where a GPS device is located without looking at it, systems like OnStar use cellular networks to relay the GPS information. So, if you’re out of the network range, you may be able to use your GPS navigation, but if you get in a crash, OnStar won’t be able to send help.
Out of site, out of mind. I have always kept valuables hidden and have never had a break in since I started driving 23 years ago (knock on wood).
BamaBob,
The GPS uses info that it receives from several satellites in line of sight of the receiver. It calculates your location by these signals while using a preloaded detail map of the country. It only works one-way. It does not transmit.
I went many years, even as an over the road truck driver without a gps. I prided myself on my navigating abilities. Then I found a deal on a Tom Tom at West Marine last June for $99. I kicked my self in the butt for not buying one sooner after using it on a trip to Branson. They are great and very accurate.
I don’t have a GPS and have never even taken a hard look at one. But, how can it give you directions, if it doesn’t know where you are?
RazorSharp, The code lock only works if you actually put a password in it! Easily bypassed using any Windows PC. Not to mention the fact that either way they going to bust out your window and that’s going to cost more than the GPS is worth.
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BamaBob, the GPS units only work one-way. In other words they simply acquire the signal from satellites in inner space. They do not “transmit” any signals back to those satellites. The type of GPS tracking device in which you are referring to like “ONSTAR” and “GPS Snitch” and the like make use of Cell-Phone towers and relay the received information acquired from the GPS satellites.
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For those of you who do not know, 90% of GPS units work on a hidden Windows CE operating system. There inside of your unit is a perfectly functional Windows PC. With the correct knowledge and software, you can have much more than a GPS unit. Just takes some reading, and a proper USB connector. You can install all kinds of great applications.
Can’t they use GPS to track down who has the GPS device?
In Europe, many, many people have GPS navigation systems, but everyone takes it out of their car when they aren’t using it.
Neither…It is portable, so it goes in my pocket. Nuvi 370
Razorsharp,
That’s great! But do the thieves know that it has a code lock on it? Or will they find that out after they bust out your car window to get at the Garmin?
My Garmin has a code lock on it…unusable without the code if it is stolen.
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