LoJack, anyone?

I work at an Assembly plant and one night 5 big SUVs were stolen off the lot, they hopped the fence and drove em thru the fence. The On Star that is built in has abilities to track and they located all 5, sort of, 2 made it across the border into Mexico, gone for good there, and 3 were found in Dallas, one was found inside a garage. Whatever the correct terminology for their GPS abilites is I dont know but WORKS DAMN GOOD.
I was reading a thread like this on another site and there is some pretty neat stuff on the market out there, one had a phone app that you could utilize yourself. When I get my build finished Im thinking of at least 3 seperate systems, alarm, couple of hidden kill switches etc etc.