A cable length or length of cable is a nautical unit of measure equal to one tenth of a nautical mile or approximately 100 fathoms. The unit is named after the length of a ship's anchor cable in the Age of Sail. The definition varies:
- International: 1⁄10 nautical mile, or 185.2 m
- Imperial (Admiralty): 1⁄10 Admiralty mile, or 608 ft (185.32 m), about 101 fathoms
- The traditional British fathom varied from 5½ feet to 7 feet in the Merchant Navy.
- U.S. customary (US Navy): 120 fathoms (720 feet, 219.456 m)