What is a fathom in nautical terms?

In nautical terms, a fathom is a unit of length specifically used to measure the depth of water. One fathom is equivalent to six feet. This measurement is crucial for navigation and marine operations, as it helps mariners understand water depth for safe passage and to avoid grounding in shallow areas. The use of fathoms has historical significance in maritime practices, providing a direct and practical way for sailors to gauge the underwater environment.

Other options relate to different measurement concepts. For instance, weight units typically refer to how heavy an object is, while time measures durations, and capacity indicates how much a container can hold. None of these definitions apply to the specific role of a fathom in maritime contexts.