How to calibrate altitude
The RS800 / RS800CX / CS500 / CS600 / CS600X measures and displays altitude. With calibration you ensure your Polar product has the correct reference altitude to base its measurement on. Check your altitude calibration whenever a reliable reference, such as a peak or a topographic map, is available, or when at sea level.
To calibrate altitude, go to Settings → Features → Altitude → Calibrate and enter the desired altitude value.
In CS500, go to Settings → Altitude SET → Calibrate and enter the desired altitude value.
To set altitude function on or off in RS800 / RS800CX, go to Settings → Features → Altitude → On / Off.
In CS500 / CS600 / CS600X the altitude measurement is always on.
How to do automatic altitude calibration