Draft Marks Meaning in Sailing

Draft marks represent a series of vertical numbers painted on the side of a boat hull. These marks indicate the depth of the boat below the water surface at that point. They are usually located near the bow and the stern for easy visual reference. Sailors use these numbers to determine how much cargo or fuel the vessel is carrying. Knowing the exact draft helps the captain navigate through shallow water without hitting the bottom. One specific example involves a sailor reading the number six at the waterline of a boat. This tells the crew that the boat requires six feet of water to float safely. These marks must be checked frequently to ensure the boat remains balanced and not overloaded. They are especially important for large commercial vessels and heavy cruising sailboats in narrow channels. Proper maintenance of the paint ensures the numbers stay visible in every different light condition. This visual tool provides a simple and reliable way to monitor the displacement of the vessel.