Yer movement is weird in fact the wording is very poor and inconsistent. In the first paragraph on movement it says
During the Movement Phase beginning with the active player, players alternate selecting one of their own ships to conduct its movement [p7].
then we get
A-A-R-A-A-R-A-A-R-A
The opposing player always chooses one of the ships to be moved: e.g. if the active player is moving three ships at a time that player chooses two and the opponent chooses the third
Which contradicts the first paragraph.
I assume in the example the active player is moving 2 ships at a time. A-A then the reactive player moves 1. But if the opponent always chooses one of the ships then what happens when you are moving only one does your opponent always get to choose? Or does 'at a time' mean 'a turn' ?
I read it and then slept on it, the wording is very unclear and I can see several interpretations. The way I understand it (and I am probably wrong) using the example in the rules ans assuming I am the active player and have 7 ships and Jim my opponent (other opponents are available) has 3 ships.
I move one of my ships. Jim chooses another of my ships to move I move it. I then choose one of his which he moves, he then chooses the next ship (it must be one of mine) and so on.
In this interpretation the order of fleet movement is determined by the numbers present but who chooses the actual ship alternates. Over the course of a battle this could simulate simultaneous movement by its unpredictability.
Another way of reading it is that:-
I move my first ship and Jim chooses my second, Jim then moves one of his ships, I move my third ship and Jim chooses my fourth ship.
This mitigates, some what, against large fleets of small ships ganging up on smaller ships.
A third way is, Jim chooses one of my ships I move it, I choose one of my ships and move it, I then choose one of his ships and he moves it, he chooses one of my ships I move it and so on.
This is actually what the second paragraph says and I think its not what was intended but I don't know.
I think the first option is fairer but weirder (in a nice way of course).
Dan what on earth, or even in space, did you actually mean?
, but of course faced with the possibility of worrying about Joe Bloggs the Governor of that planet third from the left we all do and end up using all those optional rules! My personnel weakness is multi-planet solar systems 
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) this basic roll can be altered to match others predilections/universes, in the extremes to 1 roll on the terrain table 2-6 it is open space or 1-5 roll on the terrain table and 6 its open space.