If you’re a land lubber like me, here’s a little bit of a further explanation for the ship terms... The port and starboard of a ship refer to the left side and the right side of the boat. They have corresponding colored lights stationed along the ship to identify the sides as well. Red is for the port (left) side and green is for the starboard (right) side.
Interestingly, propellers are the insignia for the uniforms of marine engineers. This symbol helps differentiate the engineering department from the deck (navigation) department for both the merchant marines and the navy.