B&G Network Speed - Manual (Page 13)

13
3 - AUTOMATIC CALIBRATION - AUTO CAL
This procedure will automatically and accurately calibrate the
boat speed and log and is the recommended method for most
boats.
NOTE: AUTO CAL can be aborted any time by pressing
the SETUP key, then the SPEED key.
• Select two markers that are easily identifiable on the ground
and on a chart, choose a place where the current is at a
minimum. Measure and record the distance between the
markers on the chart.
• It is recommended that three runs are carried out, this
accounts for tidal efforts, and improves accuracy. However a
time should selected when the current is at a minimum, ie
slack water between tides.
IMPORTANT NOTE: The total distance accumulated over the
three runs must exceed 0.16 Nautical Miles or 100 metres per
run. If this is not achieved the AUTO CAL will fail and the
procedure will have to be repeated.
• Press the SPEED key to select current boat speed.
• Press the SETUP key five times to display AUTO CAL.
• Press the ENTER key when in line with marker A, to start run
1. The display will flash AUTO C 1.
Press ENTER key again when in line with marker B, to freeze
run 1. The display will flash, showing the distance so far for
one run.
• Turn the boat around for run 2 in the opposite direction over
the same measured distance.
Press the ENTER key when in line with marker B, to start run
2. The display will flash AUTO C 2.
Press ENTER key again when in line with marker A, to freeze
run 2. The display will flash the accumulated distance so far
for two runs.
• Turn the boat around for run 3 (final run) in the opposite
direction over the same measured distance.
Press the ENTER key when in line with marker A, to start run
3. The display will flash AUTO C 3.
Press ENTER key again when in line with marker B, to freeze
run 3. The display will flash the accumulated distance for three
runs.
• Multiply the recorded distance from the chart by the number
of runs completed. This is the true distance travelled.
• Adjust the flashing display with the ¿ and À keys until it is
the same as the true distance.
• Press the ENTER key to complete the calibration. The
display will zero, and the calibration is memorised.