Compass Error
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Compass Error 3 - Calculations
Lets try another one.
Our true course plotted on the chart is 230°T.
Variation is 10°W.
From true to magnetic add west.
230 + 10 = 240°M.
Our magnetic course is 240° but the deviation card says 5°E on this bearing.
From true to magnetic subtract east.
240 - 5 = 235°C.
Our true course is 230°T and our course to steer is 235°C.
We added west variation then subtracted east deviation.
