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Why problem occurs when measure direction indoor?
TV set, personal computer, speaker or other objects will inter-
fere in the geomagnetic detection by this watch. Please keep
away from interferential objects or do detection outdoor. It will
be difcult to perform the direction detection inside a building
made of reinforced concrete. Please note that the direction
detection cannot be conducted in train or plane.
The work principle of hypsometer:
With the height increasing, usually air pressure and temperature
will reduce. This watch measures the height according to the
international standard air pressure (ISA) made by International
Civil Aviation Organization (ICAO). This value denes the
relation between height, air pressure and temperature.
Note that the veracity of the value measured will be affected in
the following situations:
When air pressure changed with the weather change;
When temperature changed extremely;
When this watch is bumped strongly.
There are four kinds of methods to denote height:
1. relative height
2. location height
3. height above sea level
4. Factory default height.
Notes when measure height and temperature at the same time:
Though the height and air temperature can be measured at
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