That's absolutely right. If you want to get the fumes out of the bilge, opening up the hatches and motoring around is not the remedy. However I believe ventilation of any kind around the engine helps prevent fumes accumulating in the bilge. If your engine is enclosed in a box, you can't smell fumes, and a blower needs to be running, with a special air inlet into the box from outside. In any case, use the nose.
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