QUOTE (Shemhazai @ Feb 22 2015, 12:06 PM)

Interesting. So if you use a jammer in every case, that means that you need a way to get the jammer physically onto the car. EDIT: As well as make it impossible to do this remotely, as you need a way to move the car.
Jammers are fairly small (-2 on the concealment) so carrying one around isn't too hard.
You do bring up the interesting idea of Remote hacking cars for theft. Because you aren't in/at the car, the owner noticing it's driving around without them isn't a terrible thing... but if the owner notices the car is missing, he/she can immediately locate the car and regain control of it very quickly by ordering it to restart (removing all your marks on it.) Plus, the entire time you have illegal marks on the car you are also gaining an overwatch score.
If your objective in stealing the car is to keep it long enough to sell, or otherwise use it, I think you're better off having some one (maybe not you) drive it manually with all the icons knocked off-line. In theory you could hack the car remotely and have a friend (or humanoid drone? Do we have ones without sword hands yet?) drive it off while carrying the jammer. Considering the cost of a Cyberdeck to do the hacking, I imagine car theft rings might work this way, with the decker (or technomancer?) hacking rides for the non-techie members to speed of in towards the chop shop.
QUOTE
Won't that cause every wireless device you drive past to momentarily disconnect?
Page 441: "You can set your jammer to not interfere with devices and personas you designate."
A cunning car thief will exclude his own gear, and the basic public icons he intend to drive past: specifically those that are involved road monitoring. You'd also be smart to add other cars that get too close, especially cop cars, so as to not draw attention to yourself. Thanks to the 1 rating drop off for every 5 meters from the jammer, most people or things you drive past won't get much more than a 1 (maybe 2) noise penalty, which isn't enough to knock key/obvious devices off-line. You just have to worry about things within 5 meters, where they get the full force of the jammer. Yah, it might be a bit odd to people, but it should be too easy to figure out where the noise is coming from, and it's a lot better than having the car's owner tracking you.
If you know the neighborhood you're in/passing through has noise issues already, you could probably get away with using a lower powered jammer, which will reduce the range of the jammer effect. Hell, with a bad enough neighborhood, you might not need the jammer at all.
Of course if you have the time, you could specifically scan the car and everything in it for icons, and then disable or remove all the icons... but that's more time than you'd probably want to take when boosting a car.
QUOTE
Won't the owner and possibly law enforcement be notified the instant the car falls off the radar?
Nothing I've read in the book indicates that you get an alert when one of your possessions goes off-line due to signal loss. The car certainly can't send an alert when it looses it's matrix connection, and unless you have a sprite or agent program (which don't run on commlinks) set to check on your car constantly, nothing should automatically notice the car is off-line. I guess, if the car was slaved to a Host system, and it had Patrol ICE running, it might notice... but that's by no means a standard setup.
That's not to say that the owner isn't somewhat aware of their vehicle (or any icon). Page 236 says "The owner of a device, host, persona, or file can always spot it in the Matrix." Moreover, ownership is like having 4 Marks on an Icon and page 235 on Matrix Perception notes that "You can always keep track of your marks, so you can spot an icon you have a mark on without a test, no matter the distance." Essentially, it looks a lot like the owner of the vehicle can automatically locate it on the matrix without needing to make a test, but they must still take the matrix perception action. In other words, they won't know the car is off-line unless they specifically attempt to interact with it.
As for Law Enforcement: Nothing in my reading indicates that the cops get an alert when something goes off-line. In fact, they don't automatically get an alert when some uses Brute Force to hack a car. The owner gets the alert, and they could probably then call the police, but the cop's aren't contacted on their own. Moreover, cars go offline for various legitimate reason. Mostly for driving through the Noise filled cities (see page. A Downtown area of a city generates 2 noise all on it's own, thanks to all the AR advertising. If someone's having a big sale, or it's special event, you can expect Noise 3 easy.