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Well I tried this out yesterday on my GPS system and it did indeed give ground speed. I was climbing out at about 2000 fps at 150 mph. GPS indicated ground speed at 148 while I was at about 10...

Your question then is really asking if the GPS will show you the speed in the "X" or horizontal direction when in fact the car is moving in both the horizontal and vertical directions. The answer is...

The GPS system makes its measurements from space based on time, altitude and location of your GPS receiver. Time and location measurements are corrected by ground stations used to corrected for...