I often run a GPS when I ski. I don’t try to set top speeds. I do have a competitive skiing background.
Last season my top speed was consistently around 77mph.
Conditions for 81 were perfect. I wasn’t trying to hit a new speed record, but consistently hit 4 runs in a row the following: 78.5, 79.1, 79.8, and 81.3. Top speed was the right turn below the steepest part. If I didn’t have the consistent data I’d doubt it as well.
Yes, the GPS has been calibrated. I even used a second GPS device a week later and it showed 78.7 and 78.9.
Most GPS units are within 0.79 miles per hour accuracy.
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