That is an odd one about the tanker. What method do you use to calculate speed? I probably wouldn't have picked up the fact that he slowed from 6 to 4 knots. Mostly I cheat and use the map plot and get a rough ratio of his speed over a given time in relation to mine. I simply mark our present positions, wait a few minutes and remark, then compare. If I am going 3 knots and have covered 150 yards and he has covered 300, then I assume he is going 6 knots.
Perhaps in the game they accounted for damage due to rough seas. On radar once in a pass I noticed a ship that apparently hit an island and sunk during a heavy storm. It just hit it, backed off, next thing I know there was the sunken ship symbol in it's place.
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