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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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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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Sign In Join now—it’s Free

Glossary Archive

Clew

The lower aft corner of a sail, where the foot and leech meet, and is often equipped with a grommet or cringle for attaching control lines such as the sheet. The clew is a critical component of a sail's geometry and functionality on a sailing vessel. It is one of the three corners of a...


Close Hauled

Cleats are primarily used for attaching mooring lines to your vessel. The mooring lines are then secured to another yacht, pontoon or harbour wall.


Closest Point of Approach

Used primarily in maritime and aviation contexts to describe the shortest distance that will be achieved between two moving objects, such as ships or aircraft, if they continue on their current courses and speeds without any changes. It is a critical parameter in collision avoidance and navigation safety systems. Key Concepts: Closest Point of Approach...


Clove Hitch

A clove hitch is a versatile, easy-to-tie knot commonly used to secure a rope to a post or pole temporarily. One of its most common uses is securing fenders to the guardrail. A clove hitch is one of the most widely used knots in sailing due to its simplicity, quick application, and ability to hold...


Clutch

A deck fitting used to grip and hold a rope or line under load while allowing for controlled release when needed.  A clutch is a specialised deck fitting commonly found on sailing yachts, designed to secure a line while still enabling it to be adjusted or released under tension. Unlike a simple cleat, which requires...


Coachroof

The raised portion of a boat's deck, typically over the cabin, providing additional headroom and space below deck. The coachroof, also known as the cabin top, is an elevated section of a boat's deck that sits above the main cabin area. Its primary function is to provide extra headroom inside the cabin, making the interior...


Coaming

The raised edge of a hatch, cockpit or skylight to help keep out water.


Coastal Skipper Practical (Motor)

The RYA Coastal Skipper Practical (Motor) course is designed for experienced motor cruisers preparing for extended coastal passages. Participants learn advanced navigation, passage planning, and handling motorboats in challenging conditions. Practical exercises include night cruising, managing tidal streams, and dealing with emergencies. By the end, participants will feel confident skippering motor cruisers on coastal voyages,...


Coastal Skipper Practical (Sail)

The RYA Coastal Skipper Practical (Sail) course is for experienced sailors preparing for extended coastal passages. Participants learn advanced navigation, passage planning, and skippering in challenging conditions. The five-day course includes night sailing, emergency drills, and managing a crew effectively. By the end, participants will have the confidence to take responsibility for longer voyages in...


Coastal Skipper/Yachtmaster Offshore Theory

The RYA Coastal Skipper/Yachtmaster Offshore Theory course is an advanced shore-based program for experienced sailors. Topics include complex navigation, advanced meteorology, and passage planning in tidal waters. Participants also learn about collision regulations and safety protocols for offshore passages. This course is essential for those preparing for the Coastal Skipper or Yachtmaster Offshore practical exams.


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