Final answer:
- Sailboats and powerboats up to 9 metres (29.5 feet) in length and PWCs must have at least 15 metres of cable, rope, or chain
- Sailboats and powerboats over 9 metres and up to 12 metres (29.5 feet to 39.4 feet) in length must have at least 35 metres (98.4 feet) of cable, rope, or chain.
- Sailboats and powerboats over 12 metres (39.4 feet) in length must have at least 50 metres (164 feet) of cable, rope, or chain.
Step-by-step explanation:
Sailors used a unit of measurement called the "fathom" to measure the depths of seas. They would count the number of knots that went underwater before the rope hit the bottom to determine the depth.
Back in the days before all the electronic gadgets for measuring depth and locating undersea objects existed, sailors used a unit of measurement called the "fathom" to measure the depths of seas. A rope was knotted every six feet, and the end was dropped over the side of the ship. By counting how many knots went under the water before the rope hit bottom, sailors could determine the depth of the water.