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Nautical Know How
  • Our Courses

      All our courses are engaging, interactive and fun! Whether formal training or simply looking to brush up, we take online learning to the next level.

      • Sailing EssentialsFreeA free course great for anyone who spends time on the water.
      • Essential Navigation & SeamanshipRYA course for beginners. Learn charts, tides, pilotage, and core seamanship with simple practice tasks.
      • Day Skipper TheoryMost PopularRYA course for inshore skippers. Plan day passages using chartwork, tides, weather, and COLREGs.
      • Coastal Skipper / Yachtmaster® TheoryComing SoonRYA course for advanced navigation and passage planning. Work with secondary ports, tidal streams, and offshore weather.
      • SRC (VHF) Marine Radio CourseRYA Short Range Certificate radio course. Study online, then take the practical exam with an RYA assessor.
  • Directory

      Are you looking for something nautical related? Our directory is an extensive list of courses and places associated with the marine industry. Hop over and search now.

      • Places
        Find anywhere nautical, including marinas & training centres. If it exists, we’ve got it listed!
      • Courses
        We help you navigate through the complex world of training and help find what’s best for you.
  • Know-How

      We believe every day’s a school day on a boat! That’s why we built Nautical Know-How, dedicated to answering your questions. Even better, if it can’t answer your question immediately, you can request it, and we’ll add it to our knowledge base.

      • Nautical Terms & Terminology
        Understanding the language of the marine world is like trying to learn a pirate’s secret code while juggling fish. Let us explain why a sheet isn’t for your bed, why “heave ho” doesn’t mean throw up (most of the time), and why “dead reckoning” is surprisingly less ominous than it sounds.
      • Why do we have tides?
        Have you ever wondered what causes the tides? Check out this video, which introduces the forces that create the tides we experience on Earth.
      • What causes our weather?
        A video introducing the drivers behind our weather, part of our RYA Day Skipper & RYA Coastal Skipper / Yachtmaster® Offshore theory courses.
      • Buoyage Flashcards
        Flashcards designed to help remember the buoys in the IALA system. If you want to learn them in detail, our module ‘Getting in and out of harbour‘, covers the IALA system and different buoys used.
      • Interactive Rule Book (COLREGs / IRPCS)
        Whether you’re a novice sailor or a seasoned skipper, we can help you navigate the IRPCS confidently and clearly. Our easy-to-use, easy-to-understand, plain English rule book with helpful interpretations of what each rule means.
      • The Salty Sea Blog
        From salty old sea dogs to fresh-faced deckhands, this blog is for anyone who finds peace, adventure, and a bit of mischief on the water. So hoist the main, set your course, and let’s sail into the stories, lessons, and musings that make life on the sea so irresistible.
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Published:25th October 202429th April 2026 Last Updated:29th April 2026
General Nautical Terminology

Cable

A strong, heavy rope or wire, often made of steel, used for mooring, anchoring, or towing vessels.

A cable refers to a thick, durable line, traditionally made from natural fibres like hemp but now more commonly constructed from steel or synthetic materials. Cables are essential in various operations aboard ships, including anchoring, mooring, and towing. One of the most common uses of a cable is in the anchor system, where it connects the anchor to the vessel, providing the necessary strength to hold the ship in place against wind, currents, and tides. Cables are also used in towing operations, where one vessel pulls another, often over long distances. In modern times, steel wire cables have largely replaced traditional fibre ropes due to their superior strength and durability. Additionally, in nautical terminology, the term “cable” can also refer to a specific unit of measurement, known as a “cable length,” which is approximately 1/10th of a nautical mile, or about 185.2 metres. This unit is commonly used to estimate short distances at sea, particularly when navigating in confined waters or when anchoring. The versatility and strength of cables make them indispensable in the safe and effective operation of vessels.

Alternative Meanings:
  • Cable

    A unit of distance traditionally used to measure short distances at sea. It is generally considered one-tenth of a nautical mile, which equals approximately 185.2 meters or 100 fathoms.

    The length of a cable can vary depending on the standard used. In the British Navy, a cable is traditionally defined as 1/10th of a nautical mile (185.2 meters). In other contexts, mainly historical or regional, a cable's length could range from 169 to 220 meters, though this variation is less common in modern usage.

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