What does "Red right returning" signify?

The phrase "Red right returning" is a mnemonic used primarily in navigation to help boaters remember how to properly navigate channel markers. It signifies that when a vessel is returning to a harbor or port, and the boat is facing upstream or towards the point of origin, red markers should be kept on the right side of the vessel.

This helps establish a clear reference for boaters to ensure they are following marked navigational routes safely. The use of red markers signifies the starboard side of the vessel in this context, which is crucial for avoiding grounding or running aground on shoals or other hazards that may be present in a channel.

The other options do not accurately capture the specific meaning associated with this phrase in navigation, as "Red right returning" specifically pertains to the position of red buoys when approaching a harbor or safe water.