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c. Log Leg1 shows the speed of the first leg of the trip as measured by
the speed log.
d. Ref. Leg2 and Log Leg2 show the same information for the second leg
of the calibration trip.
e. Ref. Aver and Log Aver show the reference and speed log speeds,
averaged between the two legs of the trip
f. Dist Leg1, Dist Leg2, and Dist Aver show the distances for the two legs,
and the average, as computed from the speed log speed.
g. Drift shows the angle between the forward and sideways velocity,
again for the two legs and the average between them.
11. If these values all seem to be acceptable, touch the column
to select it, and touch the Calibration Trip Use button.
12. You will be given the prompt message: “Set results in
calibration table?”, just as in step 8 above. As described in step 9 above,
you can put the values into a selected column of the Calibration table.
13. Check that the values in the calibration table match what you expect for
the calibration trip:
a. Ref. shows the reference speed for the trip, computed from time and
distance
b. Log shows the speed from the trip as measured by the speed log
before calibration
c. Drift shows the angle between forward and sideways speed
components for the trip.
14. Repeat the process, from steps 4 to 13, A to B and back again, this time at
50% of the ship’s maximum speed, and again for 75% of the maximum
speed. Enter all of the values into the Calibration table. The table has five
columns, allowing you to run two more lines at different speeds if you wish.
The Calibration table shows un-calibrated forward and sideways speeds on the left
of “Calibration table” and the calibrated results on the right, so that you can see
what the effect of the table is at any time during the process.
If one of the calibration trips doesn’t work well, select it by touching it,
and press the Delete button to remove it from the table.
If one of the columns in the Calibration table is bad, you can:
• Over-write it from one of the columns in the Calibration trips table (see step 9
above), or
• Stop is being used in calibration calculations by selecting any one (or all) of
the values in the column by touching it, and using the “backspace” key to
delete the value. Columns with any one of the three values blank are not
used; or
• Touch a value in a table to edit it (see below to see how this might be used).
When the calibration process is complete, if there is a printer fitted to the system,
use the Print button to make a print-out of the calibration
data as a record of the process.
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