SUUNTO E203 - Manual (Page 18)

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Note: If the user does not press any button for 20 hours in the [ALTI] mode, the unit
will exit this mode and return to the main TIME mode.
3.1. SETTING THE ALTIMETER
Four settings can be performed when in [ALTI] mode:
1. Setting the reference altitude (1st display).
2. Zeroing the altitude for altitude difference measurement (2nd display).
3. Setting the altitude alarm (3rd display).
4. Adjusting the resolution of the altitude reading (4th display).
Note: If no buttons are pushed within one minute after entering the setup, the
Escape203 automatically exits the setup mode and the values displayed at this time
will remain at the current settings.
The factory or default setting equals a pressure of 1013.5 hPa and an altitude of 0
meters.
3.1.1. Setting the Reference Altitude
Setting the unit using reference altitude leads to the most accurate altimeter readings.
Beware that adjusting the reference altitude will affect the Barometer readings since
sea level pressure and reference altitude are inter-related.
In the [ALTI] mode:
1. PRESS and HOLD the Center button in for 2 seconds. Field 3 displays "REF" and
in Field 2 the altitude reading will begin to flash.
2. PRESS either the [+] button or the [-] button to numerically scroll up or down until
the desired altitude is displayed.
3. PRESS the Center button to accept the choice and move to next menu Zeroing the
Altitude.