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When Altimeter Use is selected:
• The unit will be used as an altimeter.
• All pressure changes are interpreted as altitude changes.
• The sea level pressure reading displayed in the barometer mode will not change,
even though the absolute pressure reading will change.
When Barometer Use is selected:
• The unit will be used as a weather station.
• The unit interprets all pressure changes as being due to a change in the weather.
• Measured changes will affect only the pressure reading displayed in the barometer
mode. Both sea level pressure and absolute pressure reading will change. These
changes won’t affect the altitude reading in the altimeter mode while barometer use
is activated.
The Observer leaves the factory set to be used as an altimeter.
3.2 SETTING THE ALTIMETER
In setting the Altimeter, there are two processes that can be performed:
• The Reference Altitude (known altitude at the current location); and
• The Altitude Alarm (signals you when a certain programmed altitude is reached).
IMPORTANT NOTE:
In order to set the altitude in the Altimeter mode, the altitude must be known. That
information can be found by utilizing a topographical map, identifying the current
location with the associated altitude marked. You can proceed and follow the
instructions, setting the altimeter, 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.