Why does my nuvi 250 give me wrong max speed? Right now it claims I was going 197 mph.
Time to slow down that Ferrari....
If you lost the satellites for a period of time, the GPS will calculate the distance traveled with less time logged resulting in a greater number of miles per hour.
Some times a Garmin loses its signal and then finds it again....it then figures you went faster than you were really going.
For the Most part the speed is Very accurate.
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