When you roll initiative, you can
Evade as a free action, gaining a +2 circumstance bonus to your starship's AC until the start of your first turn. During your first turn in combat, if you Evade, increase the circumstance bonus to your starship's AC from that action by 1 (increasing it from +1 to +2 if you use a 1-action Evade, or from +2 to +3 if you use a 2-action Evade).