Many starship games have a wet-navy style movement so it is WW2 in space.
Now in space I feel 3D movement is unnecessary: 3D matters in air combat due to gravity and it's influence on the aircraft's energy - in space up and down have no meaning and the two objects fighting determine the 'plane' anyway. However vector movement IS essential - otherwise you might as well grab a set of WW2 naval rules.
I have yet to come across a better vector system than Triplanetary. Whilst hexes, transparent sheets and chinograph pens are a bit messy (and old school) the same rules principles can be applied with a single 'drift marker' which is surely less effort than recording speed and writing orders in a ship log sheet.
Triplanetary Link including Movement Rules
I'd say this is the "One True Way" of vector movement...