Suunto OBSERVER TT Guía De Usuario página 41

future weather, it stores data that supports you doing this. Remember that estimating the
coming weather should be based on different signs of nature in addition to the barometric
trend.
What does "absolute pressure" and "sea level pressure" mean?
Absolute pressure is the actual pressure in any location at any given time. Sea level
pressure equals the corresponding pressure at sea level for a certain altitude that you are
at. For example, if you are at an altitude of 1,000 m/3,300 ft the absolute pressure
normally is around 900 hPa/26.60 inHg. The relative pressure at sea level would then
be around 1,013 hPa/29.90 inHg.
What is temperature compensation?
When the unit is temperature compensated, the temperature of the unit itself does not
affect the altitude measurement of the unit. The unit can be worn on your wrist or placed
on a table - it will in either case give you the proper altitude reading providing the
weather conditions have not changed. All Suunto Observers are temperature
compensated within the range -5 to 140 ° F / - 20 to +60 ° C. Refer to Chapter 3, Effect
of Air Temperature on Altitude Measurement.
Why is the compass not working correctly?
It has been exposed to external electromagnetic disturbance and has to be calibrated.
Refer to Chapter 5, Calibrating the Compass.
Where do I find the correct declination for my area so I can set my
Observer?
Local declination, either E or W, is usually marked on maps with either one-degree or
half-degree accuracy.
When should I operate the Observer in Altimeter Use and when in
Barometer Use?
Altimeter Use (half-moon indicator below ALTI in the mode bar) is your choice when
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