Holux GPSPORT 260 PRO, Manual

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Calibration
GPSport 260 Pro comes with built-in 3D electronic compass and
barometer sensors. Calibration for barometer is necessary at the start of
each activity’s recording.
The 3D compass calibration is required to separate the earth's magnetic
field from stray magnetic fields emitted by something metallic/electronic
like a car for which may affect the operation of the compass. Without
calibration, the 3D compass may have inaccurate readings.
As for barometer calibration, the GPSport 260 Pro provides two
methods for users to calibrate, i.e. Auto calibration and Manual
calibration .
Manual calibration is recommended when the user knows his true
elevation there, for Manual calibration uses the calibrated altitude as
truth and assumes all changes in the pressure sensor are associated
with the barometric pressure, Manual calibration therefore will be more
accurate
Altimeter Calibration
A barometer is an instrument for determining the pressure generated by
the weight of the atmosphere. Users can use GPSport 260 Pro to
determine their immediate altitude and altitude gained/lost.
Barometer calibration is set to be automatically performed by default.
However, users can set the device to be manually calibrated.
Note:
If the device is set to Auto Calibration, the altitude will be gained