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The generic „Altitude‟ data can be preset so it observes different values depending on your
preferences. From „Menu > Settings > Off-road > Altitude‟ you will be able to select among the
following options:
GPS:
The values from the GPS will be directly taken.
Barometric altimeter:
The data from this utility will be taken disregards the GPS.
It is important to calibrate the barometer in order to achieve reliable data. You may
calibrate the barometer in 2 ways:
o
Manual calibration tool: If you know the present altitude, you can enter it into the
TwoNav from „Menu > Settings > Off-road > Calibrate barometer‟.
o
Automatic calibration tool: If you select the „Automatic‟ option in the „altitude‟
selector menu, TwoNav will continuously calibrate the barometric altimeter using
the GPS position along time (see following point).
If after some time you select „Barometric altimeter‟, the introduced calibration will
be saved with the „automatic‟ option, but it won‟t be updated with the new GPS
measurements.
Automatic (recommended):
the
barometric altitude will be used, but the barometer will
be automatically calibrated using the altitude data from the GPS by means of an
algorithm that optimizes the final result.
This is the recommended option for most users, as it minimizes the characteristic error of
the altitude data from the GPS and, at the same time it overcomes the limitations of the
barometric altimeter regarding atmospheric pressure and temperature, alien to altitude
changes.
4.8.10
Bearing
The „Bearing‟ data determines the orientation of the map when „orientate map‟ (track up) is
enabled. (
see „orientate map‟ section
).
TwoNav has three different ways of determining the bearing you are taking during navigation:
GPS:
The latest positions received from the GPS to calculate the bearing of our present
movement will be considered. As soon as we stop, this reference won‟t be reliable, as
there will be no movement it can refer to.
Compass:
The data taken from the electronic compass will be taken in order to
determine the orientation of the device.
Automatic (recommended)
: When driving slowly the compass data will be taken. When
driving fast the GPS position will be used.
Note
: Remember to
calibrate the compass
to get reliable data from it.
4.9 System
4.9.1
Volume
On this page you will find the following settable elements: