7.1.1 Getting correct readings
If you are engaged in an outdoor activity that requires you to know
the air pressure, you need to enter the altitude reference value for
your location. This is found on most topographic maps. Your Suunto
Essential will now give you the correct readings.
To get the correct altitude readings, you need to enter the sea level
air pressure reference value. The sea level air pressure reference
value relevant to your location can be found in the weather section
of the local newspaper or on the websites of national weather
services.
Absolute air pressure is measured constantly
Absolute air pressure + altitude reference = Sea level air pressure
Absolute air pressure + sea level air pressure reference = Altitude
Changes in local weather conditions will affect altitude readings. If
local weather changes often, it is advisable to reset the current
altitude reference value frequently, preferably before starting your
journey when the reference values are available. If local weather is
stable, you do not need to set reference values.
7.1.2 Getting incorrect readings
ALTIMETER profile + standing still + weather change
If your
ALTIMETER
profile is on for an extended period of time with
the device in a fixed location while the local weather changes, the
device will give incorrect altitude readings.
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