What type of mark is used specifically for the regulation of navigation or warning?

Regulatory marks are specifically designed to communicate important information related to the navigation of vessels and to warn mariners of certain dangers or restrictions. These marks serve several purposes, including indicating speed limits, areas where anchoring or mooring is prohibited, and hazards such as rocks or other underwater obstacles.

Their primary function is to enhance safety and facilitate orderly navigation, making it crucial for boaters to understand and adhere to the information presented by these marks. This type of mark, often colored in distinctive patterns (like the familiar shape and colors of buoys), is a key part of the navigational aids that help ensure safe passage through various waterways. Understanding how to recognize and interpret regulatory marks is essential for any captain or navigator to avoid accidents and ensure compliance with maritime regulations.

In contrast, information marks typically provide general information about locations, services, or points of interest but do not specifically regulate navigation. Daymarks are visual navigational aids usually used to indicate the presence of navigation channels or hazards during daylight. Directional aids help to show the correct route or channel, rather than placing restrictions or warning against hazards.