What is the term for the direction of travel line on the compass?

The term for the direction of the travel line on a compass is the lubber line. This feature is crucial for divers and navigators as it indicates the direction in which the vessel or diver is pointed relative to true north. The lubber line is typically marked on the base of the compass housing, and it aligns with the direction of travel, providing a clear visual reference for navigation. By following the lubber line, divers can maintain their intended course underwater, aiding in navigation and safety during their dives. Having a clear understanding of this term and how to use the lubber line effectively can enhance a diver's ability to navigate accurately and prevent disorientation while diving.