re. the cell phone GPS system. exactly how does it know where a back up is and how quickly does it determine that? I mean somehow this has to be reported doesn't it? surely every mile of highway in the country is not constantly scanned and rescanned to see if traffic is moving or not. when is it determined that there is in fact a back up worthy of reporting it vs. just a momentary glitch.
I sort of question its efficacy.
could you provide the exact name/model of phone and which plan does this as I would be interested in researching it a little bit?
bumpy