Well, first of all, if you want accuracy, the conversion factor is not 1.94 but 1.944.
Distance plays virtually no role.
If your speed is 0 or your bearing is 0 or 180, you don't need any correction, else you need to add or subtract own_speed * sin( bearing ).
If AOB is 90, you don't need correction, else your measure will probably be slower than actual target speed, due to hull width. Correction for that is hard to accurately compute though, due to hull shape.
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