B&G Network Quad - Manual (Page 13)

METHOD 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 CAL 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 CAL 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 CAL 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 S or T 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.
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