If the original question was speed through the water then current is irrelevant. (not counting the waves of course) If you just had a knot meter and no way of seeing land, the stars and no GPS, only your hand dragging through the water you would have no idea there even was a current. Now speed across the ground, current would matter but it is still a performance question. Same as a aircraft through the air....
"Let there be light!" said God, and there was light! "Let there be blood!" says man, and there's a sea!
Lord Byron, Don Juan
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