In Google Maps and Google Earth, why is my last GPS trackpoint connected back to the first?
Your GPS’s active tracklog can consist of one or more tracklog segments. If you set the CombineTracklogSegments preference setting to True, the program will combine the individual tracklog segments into one, i.e. it will connect the end of one segment to the beginning of the next segment. Back at the computer when you turn the GPS back on (so that you can download the active tracklog), it may record a few additional trackpoints. If your original trip started at your computer’s location, which is often the case, it may appear as if there’s an arbitrary line connecting the end of your trip back to the beginning. The solution is to turn the GPS’s tracklog recording off when you arrive at your destination so that it won’t record any bogus track points when it’s turned on again back at the computer.