What is the primary purpose of the markings on a Cardinal Mark?

The primary purpose of the markings on a Cardinal Mark is to draw attention to a channel feature. Cardinal Marks are part of the IALA Maritime Buoyage System and are specifically designed to indicate the direction of safe navigable water relative to the mark. Their distinct shapes, colors, and markings signify the cardinal directions: north, south, east, and west. This informs mariners of the location of hazards or safe water areas nearby. For instance, a North Cardinal Mark indicates that the safe water lies to the north of the mark. Therefore, these markings serve to guide vessels safely through potential hazards and ensure that they navigate the waters effectively.