If your talking about the white dome on top of semi trucks, that is used by the company to track there trucks. There is also an emergency button they have in the cab encase someone tries to hijack the truck. The white dome recieves and transmits location, speed and alot more.
I do think onstar does send and recieve. I'm not exactly sure how it works.
The GPS that people here use to find there way only recieves, it doesn't transmit any signal. Therefore, there is no way to be tracked.



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We track thousands of trucks across the US. One of our customers had one of their Redi-Mix (cement) trucks get in a wreck. They were able to pull up the tracking data and see that he was speeding. Allowing companies to do things like that is why they love us. Although that really isn't the reason why they track their trucks. It is mostly for coordinating jobs and such. No one actually cares that much about knowing exactly where you are and how fast you are going. That is only used in extreme instances like the one I mentioned.
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