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
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
When should I operate the Observer in Altimeter Use and when in Barometer Use?
Altimeter Use 
indicator below ALTI in the mode bar) is your choice when
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