User manual

Table Of Contents
8. Sensor
112
Using the altimeter
Applicable modes:
You can check the altitude of the current location.
Altimeter is not adjusted at the time of purchase.
Displaying range is j500 m (j1640 feet) to 9000 m
(29530 feet).
A Altitude
B Current altitude
About altitude conversion
The displayed altitude is a relative altitude
¢1
. The altitude is a value calculated by
converting an atmospheric pressure within the unit to an altitude with 0 m (0 feet) (sea
level) u 1013 hPa
¢2
as a reference.
¢1 Altitude can be expressed in two forms — as an altitude above sea level (absolute height
from sea surface) or as a relative altitude (difference in altitude between two locations). This
unit displays a relative altitude estimated by a method which uses the relationship between
the altitude and atmospheric pressure in the ISA [International Standard Atmosphere], as
specified by the ICAO [International Civil Aviation Organization].
¢2 “hPa (hectopascal)” is a unit used to represent atmospheric pressure.
About the measured altitude and atmospheric pressure
Altitude value may show errors depending on the change in atmospheric pressure compared to
areas such as locations with altimeter reference signs. Adjust frequently with [Altimeter Adjust].
Altitude announced onboard an airplane is measured using the atmospheric pressure
surrounding the airplane. It does not match the altitude actually measured inside the airplane.
Even if the unit is fixed at a constant altitude, the measured altitude may fluctuate due to the
effects of change in atmospheric pressure.
In coastal areas, the altitude changes by 1 m (3.3 feet) per 0.12 hPa.
Altitude and atmospheric pressure may not be measured
accurately in the following cases:
When there is a significant change in weather conditions
(Pressure and air temperature)
When there is a movement with a rapid change in altitude
When pressure is applied to the front or rear of this unit
(Hold this unit as shown in the figure when measuring.)
When this unit is wet (after using underwater, etc.)
¢3
When closing the side door
¢3
¢3 It will adapt to the ambient atmospheric pressure within a few minutes, and display correct
measurement values.
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