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When the GPS starts it will take a few seconds to lock up. Typically a "warm" start, where the GPS knows within reason where it is and what satellites are available, should be in the 30-40 second range. If you move during that time, the GPS has to keep starting all over because the data keeps changing. I've seen it take 20-30 minutes to get a fix if you are constantly moving. So, the routine to follow is to get the GPS powered up, then start your car, buckle up and adjust mirrors, seat, etc. In 30+ seconds the GPS should have a lock and you are good to go.
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