There's a company in San Diego that provides the same sort of service, called NetCar. It's basically a GPS device that communicates in both directions - that is, rather than just having a GPS receiver to tell you where you are, it also lets the GPS system track your movements. More and more delivery services, from UPS to local carriers, are installing this sort of thing in their trucks so dispatch can track vehicle locations - and make sure thier drivers aren't slacking off.
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