- 143 -
GPS/Sensor
∫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. Perform frequently with [Ad just ] in [Alt imeter] .
•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 1m (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¢1
–When this unit is wet (after using underwater, etc.)¢2
–When closing the side door¢2
¢1 Hold this unit as shown in the figure when measuring.
¢2 It will adapt to the ambient atmospheric pressure within a few minutes, and display correct
measurement values.