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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

AJAX progress indicator
Nautical chart abbreviations are like the secret code of the seas—except instead of buried treasure, they lead to rocks, buoys, and mysterious dashed lines that scream, 'Don’t sail here.' Learning them can feel like cracking a pirate’s encrypted diary, but don’t worry, matey! With clever tools, quirky mnemonics, and a splash of humour, we’ll help you go from 'What’s "FOUL" mean? to confidently navigating the “Wk” wrecks and “Fl G” flashes like a salty sea captain. Think of it as Rosetta Stone, but for avoiding sandbanks!
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Results: 143
  • Term
    Definition
  • Courses, RYA Start YachtingThe RYA Start Yachting course is a two-day introduction to the basics of yacht sailing. Participants learn steering, sail handling, and onboard... More Details
  • General Nautical Terminology Statute Mile

    A unit of distance equivalent to 5,280 feet or 1,609.34 meters. It is commonly used on land but is sometimes used in inland waterways.

    In...

    More Details
  • General Nautical Terminology StayPart of the standing rigging which provides support fore-and-aft
  • General Nautical Terminology, Parts of a Boat Steering Quadrant

    A mechanical device used in steering systems on boats, consisting of a quadrant-shaped gear connected to the rudder to control the direction of...

    More Details
  • General Nautical Terminology StemThe forward most part of the hull
  • General Nautical Terminology Stern

    The rear or aft-most part of a vessel.

    The stern is a critical part of any boat or ship, as it is the section located at the very back of the...

    More Details
  • General Nautical Terminology Stern Drive

    A stern drive is a propulsion system commonly used in recreational motor vessels. It consists of an inboard engine connected to a steerable drive...

    More Details
  • General Nautical Terminology Stern Light

    A white navigational light mounted at the rear of a vessel, visible from directly behind and within a specified arc, used to indicate the...

    More Details
  • General Nautical Terminology Stern Line

    A mooring line used to secure the aft (stern) of a vessel to a dock, quay, or another fixed structure.

    A stern line is an essential component...

    More Details
  • General Nautical Terminology Stern Spring

    A mooring line that runs diagonally from the stern of a vessel to a point further forward on a dock or another vessel to help control...

    More Details
  • General Nautical Terminology, Parts of a Boat Stock

    The crosspiece fitted at right angles to an anchor’s shank that helps the anchor turn onto its side so a fluke can dig into the seabed.

    The...

    More Details
  • General Nautical Terminology, Knot Stopper Knot

    A knot tied at the end of a rope, usually to stop it from passing through a hole; most commonly a figure of eight knot.

  • Weather (Meteorology) Storm

    Beaufort Scale - Force 10 (Storm Force 10)

    A storm is a weather phenomenon characterised by strong winds, reaching at least 48 knots (55...

    More Details
  • General Nautical Terminology Stove

    A compact cooking appliance or heating device, often found aboard vessels, used for preparing meals or warming the cabin. 

    The stove primarily...

    More Details
  • General Nautical Terminology Stow

    To put away in an appropriate place.  Being stowed implies that something has been safely stored and lashed down to stop if from moving when at sea.

  • General Nautical Terminology, Navigation STW

    The velocity at which a vessel moves relative to the water it is travelling through, excluding the effects of current or tidal flow.

    Speed...

    More Details
  • General Nautical Terminology, Navigation Superbuoy

    Large buoys, generally more than 5 m in diameter, are distinguished on charts because their unusually large size renders them a potential hazard...

    More Details
  • General Nautical Terminology, Navigation SV-ECS

    Electronic navigation standards for commercial vessels less than 24m .

    Equipment meeting the requirements of this performance standard is...

    More Details
  • General Nautical Terminology, Navigation SwashwayA narrow channel between shoals
  • General Nautical Terminology Swinging Room

    The area around a vessel at anchor where it can safely swing with changes in wind or tide without risk of collision or grounding.

    Swinging...

    More Details
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