To minimize the difference between locally indicated and measured values, you should update the reference altitude value before setting off on and during treks or any other activities where you take altitude readings. You can find out the altitude at your current location from signs, maps, on the Internet, etc. While mountain climbing, it is highly recommended that you check a map, local altitude indications, or some other source for your current location’s altitude and regularly calibrate watch readings with the latest information.

• Differences between actual altitude and watch readings can be caused by the factors below.

• Though altitude readings can be taken without calibration, doing so may produce readings that are very different from indications by altitude markers, etc.

1.Pull out the crown.

2.Rotate the crown to calibrate the displayed value to that of a local altitude (elevation) marker.

Calibration unit: 1 m (5 feet)

• To return the altitude setting to its initial factory default, press (A) and (C) at the same time.

3.Push the crown back in to complete the setting operation.