What indicates a channel's right side when approaching from open sea?

Nun buoys are specifically designed to indicate the right side of a channel when navigating from open sea. These buoys are typically red in color and conical in shape, resembling a "nun" or a pointed top that helps mariners determine their position and direction. According to the international and U.S. Aids to Navigation System, when a vessel is entering a harbor or channel from the sea, red markers mean the right hand side of the channel, allowing for safer navigation and ensuring vessels stay within the designated pathways.

The other options serve different purposes. Can buoys are green and indicate the left side of a channel, while lighted buoys may provide signals for navigation but don't specifically indicate channel directionality in the same colored context as nun buoys. Static markers generally refer to fixed signs or structures providing information rather than floating buoys that dynamically guide vessels.