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Calibration example 5
As an example we will attempt to recreate the leeway calculation that WTP3 does as standard.
The standard calculation is based on the formula:
Leeway =
K x Heel
Boatspeed2
Refer to the setting.d le for more information.
Let us suppose we wish to recreate this but articially limit heel to 25 degrees and using a leeway constant of 6.4.
The le (leeway.cal) would look like this:
4 0 0 1 0
table 89 =
-30 –25
-25 -25
25 25
30 25
constant 6.4 *
variable 91 /
variable 91 /
The rst line of this is taking the input from sample.d for Leeway and ensuring it is set to 0, the output of the rst
line is 0 no matter what the input (refer to example 1 above). The table then takes the value of Selected Heel
(bg_vars variable 89) and the equals signs means that we are assigning values for leeway based on heel.
The eect of this table would be that, for Heel values up to 25, the value assigned would be exactly the same as
the Heel angle. Above 25, the assigned value will stay at a constant of 25 since when the system will interpolate
between 25 and 30 the assigned value remains 25, and beyond 30, the extrapolation will still give the value 25.
The next line will multiply by the leeway constant of 6.4 and each of the nal two lines will divide by selected
boat speed (bg_vars variable 91) to complete the formula.
Summary
The following provides a summary of the operation of the calibration tables:
The calibrations are applied sequentially, so that those specied rst in a le will be applied before
those specied later.
Identiers recognised are table, constant and variable.
Number ‘–1’ indicates that the calibrations are applied directly to the variable.
Any other number indicates that the calibration is with respect to a dierent variable in the WTP3
database, with the number being the variable number from bg_vars.d.
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