Piney is absolutely correct. All ships have a turn mode of 1 at Speed 0. This can be quite handy for large, lumbering ships that can afford to go slow for a turn, but need to change direction reasonably quickly.
ok, follow up question if you are going speed zero and use acceleration can you choose to move backwards? and if you can / do are yuo able on a different suppulse accelerate forward?
To reverse you have to come to a complete stop (start turn stopped or Emergency decel) or pay a braking cost (occur before energy allocation) and do speed 0 in reverse --
If you stop you can't accelerate ---
So you have to wait till next turn to move at all ---