does it work as long as you don't have any stress tokens?

A Koiogran is its own bearing (along with Left Bank, Left Turn, Forward, Right Turn, Right Bank, and Stop).
Navigator would let you pick from two different koigrans (no ship yet has 3 k-turns available, aside from that one interceptor pilot who has a Navigator attached to it.).

Moreover, Navigator specifically says that you can't navigate to a stressful maneuver if you already have a stress token, though normally this applies to Hwks' and Shuttles' (and soon the B-Wings) non-koiogran Reds.

Ok great. Thanks. So just the Firespray and the the Falcon could switch from the 3 to the 4 k turn (or vice versa) if i understood you correctly.

Ok great. Thanks. So just the Firespray and the the Falcon could switch from the 3 to the 4 k turn (or vice versa) if i understood you correctly.

Eeyup. If any other ship with multiple Koiograns and a Crew Slot enters the game, they can do so as well.

Wow. It never even occurred to me you could do this. I always forget that Navigator works on more than just banks and turns.

Guess I need to fly me some Firespray a bit more often.