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Lost mileage?

My friend and I did a 100+ mile ride yesterday, he has a Garmin 520, I have the 830, he logged 103 miles, logged 101 miles, why the different, we both started and finished together?

0 Wongataa over 4 years ago

If you are both using speed sensors then one or both of your wheel wheel settings was incorrect. If you were both using GPS for distance/speed then it is GPS position variability (it is never 100% perfect all the time). If one of you was using a speed sensor and one of you GPS speed/distance it will be a mixture of the two.

0 looigi over 4 years ago in reply to Wongataa

Yeah. Another thing that might contribute to the difference are one using Smart Recording and the other Every Second if using GPS for distance rather than a wheel sensor.

If using a wheel sensor, careful rollout calibration of wheel circumference can be more accurate than that done by the Auto Calibrate routine of the device, which uses GPS over about a 1 km track. If that occurs over a tortuous rather than a straight course segment, it will be less accurate.