Suunto Observer Instruction Manual page 21

provided in the section below.
If the Altitude is not known, you can set the sea level pressure in the Barometric mode. Refer
to Chapter 4, Setting the Sea Level Pressure.
Setting the Sea Level Pressure will adjust the altimeter to the current altitude within
approximately ten meters or 30 ft.
For information regarding the effect of air temperature on altitude measurement refer to the
last section of Chapter 3.
Information on the current sea level pressure can be obtained through newspapers, local
news and radio weather reports, the local airport facility or through the Internet under local
weather.
To set the altimeter:
1. In the altimeter main mode (mode indicator below ALTI), Press the [SELECT] button for 2
seconds. In the top field, the text "RE" (indicating reference altitude) displays. In the mid-
dle field, the current altitude displays. In the bottom field the half-moon shaped use indi-
cator under the indicator bar will begin to flash (Altimeter-Barometer use feature) and the
text "USE" will appear.
2. Press either the [ON OFF] or [QUICK] button to toggle the icon to the position under
"ALTI" (for altimeter use) or "BARO" (for barometer use).
3. At the desired preference, press the [SELECT] button to move to the next setting. In the
middle field, the reference altitude value will begin to flash.
4. Press either the [ON OFF] button to scroll the value up or the [QUICK] button to scroll
down.
5. At the desired reference altitude, press the [SELECT] button to move to the next setting
(Altitude Alarm setting). In the top field, the "ON" or "OFF" will begin to flash.
6. Press either the [ON OFF] or the [QUICK] button to toggle between the "ON" and "OFF"
for the Altitude Alarm.
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