The right side of the vessel is the starboard side, the light is green. The light is coordinated to the starboard side of the vessel no matter how you look at it. Refer to Rule 21 of the 72 COLREGS, a link is provided below.
The head and starboard side is toward you
The head and starboard side of the vessel is toward you
you are following another vessel on it's starboard side. the stern light and stbd running light are visible
All vessels at sea use a red light on the port side (left facing forward to front of vessel), and a green light on the starboard side (right).
Red marks the Port or left side. (Green is Starboard or the right-hand side.) Port
You are looking at the Starboard (right) side of that boat. If it is moving, it is moving to the right.
Green
A green light is on the starboard side of the vessel. So it may mean that the starboard side is directly facing you.
During nighttime transit another boat's lights show: Green - the right, or starboard side, of that vessel; Red - the left, or port side, of that vessel; White - the rear of that vessel. The vessel is heading directly toward you
The red light should be on the right side, or port side, of the boat. The green light should be on the left, or starboard, side of the boat.
you are on the port side of the vessel