The term 'Back at Sea' is a phrase used to describe the return of a vessel to the open ocean after being in port. The crossword solutions for this phrase are 'STERN' (5 letters), 'Astarboard' (6 letters), 'AFT' (3 letters), and 'ABAFT' (5 letters). STERN refers to the rear of the ship, Astarboard is the direction to the right of the ship when facing forward, AFT is the back of the ship, and ABAFT is the area behind the STERN.