Chris BHR - I might be missing something but in...
I might be missing something but in the Leeway calculation in the derived-data plugin it uses requires [navigation.headingMagnetic(👍), navigation.courseOverGroundTrue(👍)] but it doesnt ask for magneticVariation. This seems to me like the Magnetic value is being subtracted from the True value which correlates with the results i'm seeing being about 15 degrees more than i would expect (which is the Magnetic Variation where i am)
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You are right. This calculation ignores magnetic variation. It also ignores tidal currents. It is useless.
there is another leeway calculator in derived data that uses a formula to estimate leeway.
Then there is my Speed and Current plugin that estimates leeway using for a given speed and attitude. But you'll need an attitude sensor and a well calibrated heading sensor for this one.