No idea how I didn't notice this before, but there are no movement systems in Intercept Orbit. Or at least it appears that way, since there are no movement systems listed along with the weapon, defense, comms, and catapult systems in the current version of the rules. This isn't really a rules question, but more of a "why is that" question.
So, why is that?
I'm guessing it's so the ships in IO really do maneuver like the lumbering beasts they're meant to be, but I could be wrong.