among the zero altitude, absolute altitude, sea level pressure and
factory default adjustment.
2. To adjust the watch by using absolute altitude adjustment, press
the E button in absolute altitude display, and the altitude reading will
appear.
3. When altitude reading is appeared, press the E or C button to
increase or decrease the number to the target one. (hold down the
button changes the number at a higher speed).
4. If the setting is completed, press and hold the B button to confirm
setting and exit the adjustment display.
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