What does the 'CUP' refer to on a nautical chart?

The term 'CUP' on a nautical chart refers to the Common User Point, which is a reference used for identifying specific locations on a map that are accessible or usable by multiple vessels or users. Understanding the navigational significance of such points is essential for safe and efficient navigation, especially in busy or complex maritime environments.

Common User Points help mariners when planning routes and making decisions based on traffic density, navigable channels, or landmark visibility. These points can serve as a guide for vessel positioning or as waypoints for navigation, facilitating better communication and coordination among various users in shared waters. Recognizing the importance of a Common User Point contributes to safe maritime operations and enhances situational awareness while navigating.