What is found on the lead line at the 3 mark?

The lead line is an important tool for determining depth and underwater conditions, commonly used in navigation and boating. The marks on a lead line indicate specific measurements; in this case, the 3 mark signifies that there are two strips of leather. This consistency in marking helps sailors identify the measured depth easily.

By having two strips of leather at the 3 mark, it maintains clear and standardized communication about the depth of water. Properly marking lead lines is essential for safety and accurate navigation, as it allows crew members to make informed decisions while at sea. The presence of two strips at this depth helps quickly distinguish it from other depths marked on the line, ensuring efficiency in operations.