Final answer:
A vessel spotted at 45 degrees on the forward starboard side is reported as being on the starboard bow.
Step-by-step explanation:
A vessel spotted at 45° relative on the starboard side, forward is reported as being on the starboard bow. This position means that the vessel is seen at an angle ahead of the ship's beam on the right side.
Positions at sea use relative bearings, with 0° meaning directly ahead (bow), 90° indicating directly abeam (side), and 180° indicating directly behind (stern). Starboard refers to the right-hand side of a ship when facing forward.