One problem, Duci: ahead 2/3 is 8, not 10 knots. Either increase engine power to 48% (from 40%) for 2/3 or modify efficiency. I have modded ahead standard to a flat 50% engine power for the sole purpose of having 10 knots at the touch of a button. I don't fancy manually setting the speed everytime I surface (up to 10 times a day). It's repetetive and only gets on one's nerves.
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