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BandG WTP3 Manual

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The rst line of the le still works the same as before but the result is then further calibrated from the table.
The –1 following the word Table indicates that the corrections are applied directly to the output from the initial
calibration. Next, the addition sign (+) after the –1 indicates that the corrections in the table are to be added.
Then, the numbers in the left column indicate values of the incoming data, while the right column indicates the
correction to be applied, with interpolation for values between the dened values. The table below indicates the
result of this two-stage calibration:
ORIGINAL DATA RESULT OF FIRST LINE RESULT AFTER TABLE
0 020 028
90 110 108
180 200 192
340 000 010
You can see the interpolation for headings between those at which the corrections are specied and that the
calibrations in the table are applied to the output from the rst line of the le rather than the original input.
It is also possible to calibrate your variable with respect to another variable in the WTP3 database.
Advanced calibration example 2
For example, you could enter:
5 0 20 5 25
table –1 +
0 10
180 -10
360 10
table 0 +
-20 10
0 0
20 10
The rst line and rst table of this are identical to above, but the outcome of the rst table is then further
modied by the second table. In the example, the –1 after the word table indicates that the correction was
applied to the variate itself. Entering any other number after the word table means that we are calibrating with
respect to another variable in the WTP3’s database, with the variables referred to by the bg_vars identication
number (see bg_vars.d).
In the example above, the 0 refers to the bg_vars identication number for Heel. The second table therefore
applies corrections depending on the angle of heel: the st column is the angle of heel and the second is the
correction to be applied to the compass. The result of the second table in the above example would be:
INPUT FROM 1ST TABLE ANGLE OF HEEL RESULT AFTER 2ND TABLE
50 30 65
50 10 55
50 0 50
50 -20 60
50 -30 65
Here, the oset to the compass heading is altered by the heel angle. Of course, the corrections in the previous
table will continue to be applied before the corrections with respect to heel.
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