Yes, that is what I was referring to. "Land" tanks are sometimes told to go for a specific distance on a particular compass bearing so to ensure accuracy, the turret is put into the straight ahead position and the compass adjusted for maximum accuracy but this is not the case with Valentine DD tanks. Their operational orders would be to attack a particular bunker etc, probably in view. The approach swim however was always done on a compass bearing and while swimming, the Valentine DD would have its turret reversed, hence my suggestion that the compass would be adjusted with the turret reversed and a special tag issued to note that fact. The reason I queried rather than stated it is because my tank does not have such a tag although all the others seem to be present. (Sherman DD did not have this problem, they floated with turrets to the front)