Skills that are CLASS specific can only be used when your active captain is of that class.
All skills are non class specific except Good Position,Strafe,Overload and Magnetic Mines.
How do I know whether my skills are activated?
Captains can only know via the combat replay.
Captains are to note that some skills have a chance to activate during combat.
Only Outmaneuver and Strafe has a 100% chance of triggering on defense.
Charge! has 100% chance of trigger on offense only.
Scatter Shot has 100% chance of trigger on both offense and defense.
Other skills may or may not activate during the combat.