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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.

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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.
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        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 202428th August 2025 Last Updated:28th August 2025
General Nautical Terminology | Parts of a Boat

Traveller

A sliding fitting or track on a sailing vessel, used to adjust the position of a sail’s sheet or other control lines for optimal sail trim.

A traveller is an essential component of a sailboat’s rigging system, designed to provide precise control over the angle and tension of the mainsail or other sails. It typically consists of a horizontal track mounted across the cockpit or near the base of the mast, along which a sliding car or fitting moves. This car is connected to the mainsheet or other control lines, allowing the sailor to adjust the sail’s position laterally relative to the centreline of the boat. By doing so, the traveller enables fine-tuning of the sail’s shape and angle to the wind, which is critical for optimising performance under varying wind conditions.

The traveller system is particularly useful when sailing upwind or in gusty conditions, as it allows for quick and efficient adjustments to depower or power up the sail without altering the mainsheet tension. For example, moving the traveller to windward increases the sail’s exposure to the wind, while moving it to leeward reduces it. This provides a level of control that is both more nuanced and more responsive than relying solely on the mainsheet. Travellers are commonly found on racing yachts and performance-oriented cruisers, but they are also a feature on many recreational sailboats due to their versatility and effectiveness. Proper use of the traveller is a key skill for sailors aiming to maximise their vessel’s efficiency and speed.

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