Bukh D4 Operator's Manual page 123

Calibration and Settings
124
Resetting the calibration
1 Turn the ignition on and move the control levers to
neutral.
Start the engines.
2 Activate calibration mode by depressing the
docking button for 5 seconds.
An audible signal will confirm that docking mode is
activated and the docking button lamp will light up.
3 Press the docking button. Calibration is now reset,
which is confirmed by an audible signal.
The system is now in docking mode
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