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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.
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      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
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      • 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 20243rd January 2025 Last Updated:3rd January 2025
General Nautical Terminology

Ahoy!

A nautical greeting or hail used to attract attention, signal presence, or establish communication between vessels or individuals at sea.

Ahoy! is a traditional maritime term used for centuries as a greeting or call in the nautical world. Its origins can be traced back to the Middle Ages, deriving from the Middle English cry “hoy!” or the Dutch word “hoi,” both used to draw attention. In seafaring, “Ahoy!” became a versatile and practical exclamation for sailors to communicate across distances, whether to hail another ship, alert a crew member, or announce one’s presence when approaching a harbour or dock. It is distinctively associated with the maritime domain and carries a sense of camaraderie and tradition among those who work or travel on the water.

The term is particularly effective in marine environments because its sharp and clear sound carries well over the noise of waves and wind, making it an ideal choice for communication in challenging conditions. It is often used with other terms, such as “Ship ahoy!” to identify a vessel in sight or “Land ahoy!” to announce the sighting of land. While its practical use has diminished with modern communication technologies like radios, “Ahoy!” remains an iconic element of maritime culture and is still used ceremonially or playfully in nautical settings. Its enduring charm lies in its ability to evoke the romance and adventure of life at sea, connecting modern sailors and enthusiasts with the rich traditions of their maritime heritage.

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