In the core RT book it states on page 214 that "Unless specified otherwise, a starship’s turn may never be more than 90 degrees."

Does the maneuver "Come to New Heading" (on the same page), which allows you to turn twice, count as "unless specified"?

By the rules as written it doesn't seem to (it doesn't state an exception), so that would give Light Cruisers and bigger a way for them to turn 90 degrees in one turn. But it also means that it would be (almost) useless for Frigates and below.

What have you done in your campaigns? Do you allow Frigates and smaller to turn 180 degrees in a turn?

"A starship's turn may never be more than 90 degrees"

Come to new heading lets you turn twice.

Two times 90 is 180.

I'm not sure where the problem is.

Except that the wording of the first sentence has all the finesse of a drooling caveman trying to force an Ork-shaped peg into an Eldar-shaped hole.

You're right, this is really simple.

I got lost in the multiple meanings of the word "turn": 1 turn of combat vs a ship turning.

I misread it for some reason and thought the first sentence was essentially trying to say "In one turn of combat, a starship cannot rotate more than 90 degrees". Thanks for the reply.