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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 & SeamanshipA great introduction to navigation and basic seamanship.
    • Day Skipper TheoryMany of the best skippers started their journey here.
    • Coastal Skipper / Yachtmaster® TheoryComing SoonEssential preparation for the Yachtmaster® practical exam.
    • SRC (VHF) Marine Radio CourseAn essential course for anyone intending to use a marine radio.
  • 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 nauctical, including marinas u0026 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 u0026 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 & SeamanshipA great introduction to navigation and basic seamanship.
    • Day Skipper TheoryMany of the best skippers started their journey here.
    • Coastal Skipper / Yachtmaster® TheoryComing SoonEssential preparation for the Yachtmaster® practical exam.
    • SRC (VHF) Marine Radio CourseAn essential course for anyone intending to use a marine radio.
  • 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 nauctical, including marinas u0026 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 u0026 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: 57
  • Term
    Definition
  • Flag Semaphore, Signals & Communication Letter A (Flag Semaphore)
    Letter A (Flag Semaphore)

    This shape represents the Letter A (Flag Semaphore) and the Number 1 (Flag Semaphore).

    The presumed signals are letters. The signaller...

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  • Morse Code, Signals & Communication Letter A (Morse Code)

    International Morse Code sequence representing the letter A.

  • Nautical Saying All at sea

    All at sea is a nautical term for a situation where a ship or boat is adrift or lost at sea without any clear direction or sense of location.

  • Nautical Saying All at sea

    In a broader sense, it can also be used figuratively to describe a person who is confused, disoriented, or unsure about what to do in a...

    More Details
  • General Nautical Terminology Aloft

    A position above the deck, typically in the rigging or on the masts of a ship.

    Aloft is used to describe any position above a vessel's deck,...

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  • General Nautical Terminology Alongside

    The position or location next to a vessel, dock, or quay where a ship can be moored or secured. 

    The term alongside is a fundamental concept...

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  • General Nautical Terminology, Nautical Saying Aloof

    Aloof originally had a different meaning than its modern-day use to describe someone emotionally distant. In maritime language, Aloof comes from...

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  • Phonetic Alphabet, Signals & Communication Alpha

    Pronounced: AL-far

    Letter "A" in the phonetic alphabet system.

  • Phonetic Alphabet, Signals & Communication Alpha

    Pronounced: AL-far

    Letter "A" in the phonetic alphabet system.

  • Organisation American Sailing Association (ASA)

    A US-based organisation that provides sailing education, certification, and accreditation for sailing schools and instructors. 

    The American...

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  • General Nautical Terminology Amidships

    The central part of a vessel, both longitudinally and laterally, located between the bow and stern.

    Amidships is a crucial term in nautical...

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  • General Nautical Terminology Anchor

    A heavy object, typically made of metal, designed to grip the seabed and hold a vessel in position.

    An anchor is a crucial piece of equipment...

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  • General Nautical Terminology Anchorage

    A designated area where a vessel can be securely anchored, typically marked on nautical charts and chosen for its safe holding ground and...

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  • General Nautical Terminology Anchor Aweigh

    The moment when an anchor has been lifted off the seabed and is no longer holding the vessel in place.

    The term "anchor aweigh" is a...

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  • General Nautical Terminology Anchor Ball

    A black spherical day shape hoisted on a vessel to signal that it is anchored during daylight hours.

    An anchor ball is a crucial piece of...

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  • General Nautical Terminology Anchor Buoy

    A small floating marker attached to an anchor to indicate its location on the seabed.

    An anchor buoy is a vital piece of equipment used in...

    More Details
  • General Nautical Terminology Anchor Cable

    A heavy-duty rope, chain, or wire used to secure a vessel to its anchor, ensuring it remains stationary in the water.

    An anchor cable is a...

    More Details
  • General Nautical Terminology Anchor Light

    A white light displayed by a vessel at anchor to indicate its position to other vessels during the night or in poor visibility conditions.

    An...

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  • General Nautical Terminology Anchor Locker

    A dedicated storage compartment, typically located in the bow of a vessel, used to store the anchor and its associated gear, such as the rode and...

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  • General Nautical Terminology Anchor Roller

    A fitting mounted on a boat's bow designed to guide, support, and secure the anchor and its rode during deployment and retrieval.

    An anchor...

    More Details
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