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Parameters
Note: It is only recommended that advanced users alter the parameter les directly as described in this chapter. Most
simple calibration, damping etc. can be controlled from Deckman as described in Chapter 2: Basic Operation.
Calibration
Each variable requiring calibration has its own calibration le (.cal le extension), all calibration les are located
in the Calibs directory.
Various calibration functions are available to the WTP3 but most of them are variations on linear as in the
diagram.
The rst parameter describes the type of calibration:
x2
ID Calibration Type
0 Null Calibration
1 Ordinary Linear
2 Linear for 0º to 360º
3 Linear for -180º to 179º
4 Table
5 Table for 0º to 360º
6 Table for -180º to 180º
y1
y2
x1
The next two numbers are x1, y1; and the nal two are x2, y2. x is the independent variable (which is actually a
voltage or pulses per second for boat speed and wind speed) and y is the Dependent variable that we need to
calibrate.
We will use the example of calibrating a compass. A possible simple calibration le (heading.cal) might look like:
2 0 20 5 25
This would add a 20° oset, it is unlikely that you would ever have to apply such a large oset to a compass the
large numbers are just to illustrate the functionality below.
Functions 4, 5 and 6 are more complicated. The rst line of the le is the same as for calibrations 1, 2 and 3; after
this you create one or more tables to further calibrate the variable, and these operate on whatever the output is
from the rst line. The rst way that this can be done is with one simple table of corrections.
Advanced calibration example 1
A sample le might look like:
5 0 20 5 25
Table –1 +
0 10
180 -10
360 10
60


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