Red nun buoy means what?

A red nun buoy is a type of navigational aid used in maritime contexts, typically marking the right side of a channel when approaching from the sea. It is cylindrical in shape and painted red, following the IALA (International Association of Lighthouse Authorities) system. In the U.S., it is also referred to as a "nun" buoy, indicating its position in relation to the channel. Mariners use these buoys to help ensure safe navigation through waterways.