You may reassign any or all Deckhands currently on any of the 4 Deck Assignments (including those from Repair), placing them into any Assignment. You cannot reassign Deckhands on the Wheel. Deckhands assigned in this way to Rigging or Cannons can give you an immediate boost to Sail or Attack Bonus Actions, and those assigned to Extort can generate Gold if you have passed the Ship Line this turn.