Ah, okay, these rules make sense, and with them my
Philip Augustus wouldnīt have been a sitting duck..

But the rule doesnīt help a ship in this position, the north edge is
the egde of the map, to south the maps goes normal:

Because even with the turning around two hexsides, itīs stern would
positioned on one of the half hexes, and therefore it canīt
move away, because it would count as destroyed. Right?
A bigger ship could come out of this, because it turns around itīs middle
hex, so it wouldnīt be a problem.
But can this be true? A bigger ship can outmaneuver a class 1 destroyer?