Let's say a small ship with perfect maneuverability (turn 0) and a speed of 12. I move my ship 10 hexes, since turns aren't counted against your movement, that means my small ship can turn to face to opposite direction, correct?
If a starship has perfect maneuverability (the distance between turns is 0), the ship can make two turns for each hex that it moves (allowing it to turn around a single point).
With speed 12 it should be possible to end up in the same hex facing the other direction.