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My understanding is that the Nav uses the Vehicle Speed Sensor (VSS) to match up with the GPS satellite.. The two then work in concert to track location and speed.
The problem is that the NAV unit doesn't receive the VSS signal properly.. or doesn't decode it properly.. So the GPS beacon is giving an approximate change in location, but then the VSS signal is saying somethign completely different.. so the system freaks out and says GPS signal lost until it can figure out how to sync up.
Mine drops signal by the end of my street every single time.. it can take anywhere from 2 to 20 minutes to pick up signal again.. it's basically worthless right now.
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