Starboard side

Starboard side designates the right side of a vessel

Port and starboard are nautical and spatial navy terms of orientation that deal unambiguously with the structure of vessels and spacecraft. Their structures are largely bilaterally symmetrical, meaning they have mirror-image left and right halves if divided long-ways down the middle.

One asymmetric feature is that on aircraft and ships where access is at the side, this access is usually only provided on the port side.

To understand which is which, when a person is facing the bow on a vessel, that is, forward towards the direction the vehicle is heading when underway, the port side is the left-hand side and the starboard side is the right-hand side. However, port and starboard never change; they are unambiguous references that are not based on the relative directions of an observer, just as the cardinal directions of east and west don't change no matter the direction a person faces.

Evr since all ships of Union origin (Civilian and Military) use these terms and use position lights (Red and Green)

Red for Portside

Green for Starboard side