So I read of a car hijacking that ended in hours because the owner left his cell phone in the car. So for ~$6/year: Bob Wilson
Available commercially as LoJack. And it might be easier to get the tracking information when the need arises. Also available in GM vehicles with OnStar. There may be others. Either way, you have to make the arrangements ahead of time to track from another device.
Not only that, but I can disable my Corvette remotely. GM's OnStar Shuts Down Stolen Cars Remotely | Autobytel.com