i have been using my gps as a counter measure for some time. i have noticed alot of people are using more than one gps in there cars at the same time, i have no idea why. can someone tell me what reason people would have to run two gps at the same time? i currently have a garmin 1490lmt and i have an old 200w and 205w doing nothing. all loaded with trapster except the 200w.