What should you do when returning to port from seaward and you see a red buoy?

When you are returning to port from seaward and encounter a red buoy, the correct action is to keep the buoy on your starboard side. This is based on the navigation rules established by the U.S. Aids to Navigation System, which indicates that red buoys are typically placed to mark the right side of the channel when approaching from the open sea.

In this context, keeping the red buoy on your starboard side means you are following the standard "red-right-returning" rule, which helps ensure safe navigation and maintains proper channel usage. This system assists boaters in understanding their position relative to the navigational aids and keeps them oriented towards the safe passage into port.

While there are other options that involve positioning and distance to the buoy, only maintaining it on your starboard side aligns with standard maritime navigation practices and enhances safety when entering a channel.