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I’ve seen these, and even though they block incoming signals, or “pings” for lack of a better term, are you certain that they block outgoing signals???

Sure, they stop your Tom Tom and other vehicle devices from receiving, but do they stop the outgoing “handshake” signals???

And once you are outside the “bubble”, obviously, unless you have unpowered any device you have on you, you’ll sing like a canary once outside that “bubble”...

So you can get one of these devices, but you need to understand the complete situation, and do the things to keep you off the radar outside the “protection” envelope they claim to provide...

Just throwing this out there for general consumption...

I’ve seen these, and even though they block incoming signals, or “pings” for lack of a better term, are you certain that they block outgoing signals???

You're right, because look at what I found:

Covertrack CT-100 Advanced GPS Tracker
The CT-100 uses the most advanced location techniques available to determine the location of an asset. The CT-100 enables the operator to obtain a location fix inside buildings, parking garages, and other dense urban areas. There is no external antenna needed and the device does not need to “see the sky” as normal GPS devices do. The CT-100 will work inside the trunk of a vehicle, in armored vehicles, indoors, and other locations where a standard GPS device would fail. The CT-100 will also defeat many of the GPS jammers that are now on the market.
How Does it Work?
When the CT-100 is requested to report it’s position, it attempts to obtain a fix using GPS satellites. If it is unable to obtain a GPS fix due to the device being inside a building or under metal, it reverts to cell tower triangulation mode. It will then automatically determine its position by triangulation with Sprint cellular towers in the area using AFLT (Advanced Forward Link Triangulation) This whole process is normally done in under 10 seconds. The device is also always on, so it can be “polled” any time. Reports are then transmitted to a web site where the user can determine the location of the asset. Tracking Plans start at $19.95 per month.

That means you'd also need one of these:

Silencer - Full Spectrum Cellphone Jammer (CDMA + GSM + 3G)

You are right. You can’t rely on the effectiveness of these jamming devices.

If you’re really serious about not getting tracked, then you should get one of those undercarriage inspection mirrors, a kind of mirror on wheels with a handle that border guards and building guards use to look for bombs strapped to the undersides of vehicles.

I can’t imagine anybody tracking me and my commute is by subway and anybody who wants to know where I go every day could probably find out in about 5 minutes but if I used my car more often or lived in a western state and had any reason to think these creepy crawly manson-like fed-agents were going to stick something on the bottom of my car, I’d get a mirror and inspect my car every once in awhile.

But then I guess the question becomes, what do you do if you find one of those devices? If you touch it, are you breaking the law?