B&G Deckman - Manual (Page 111)

Chapter 7: Instruments
7.6
Calibrate Boatspeed
Allowing you to calibrate your boat speed correctly, this function works
in exactly the same way as the traditional method of measuring the time
taken to cover a known distance. Deckman will automatically calculate
the calibration values from the tests you select.
Click Start run at the beginning of the run, and then End run to finish.
Details of each run are displayed in the table: the start time of the run,
the distances from your input, the log and the GPS are shown, Del Time
shows the elapsed time for the run, and the course during the run is
shown on the extreme right. You can select whether to use the distance
entered by you or that received from the GPS in Calibration distance.
In the Use current box, you can choose what type, if any, of current
information to factor into the calculations. Input the runs you wish to use
in the calibration in the Selected runs in calculation box.
Figure 7.4