Why do ships use port and starboard instead of left and right?

Unlike left and right, port and starboard refer to fixed locations on a vessel.

WHY PORT and STARBOARD? Why not Left and Right?

Ocean going vessels ~ NOAA Ship Fairweather Begins Survey Mission

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Why do ships use port and starboard instead of left and right?

Port and starboard - Wikipedia

Why do ships use port and starboard instead of left and right? - Quora

Did the words port and starboard originate from the side of the

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Why Do Ships Use Port & Starboard? - Martide

Why do ships use port and starboard instead of left and right?

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Why Ships Use Port and Starboard Instead of Left and Right?

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WHY PORT and STARBOARD? Why not Left and Right?