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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
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      • Courses
        We help you navigate through the complex world of training and help find what’s best for you.
  • Know-How

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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:19th March 202519th March 2025 Last Updated:19th March 2025
General Nautical Terminology | Safety | Signals & Communication

VHF Radio

A communication device that operates on Very High Frequency (VHF) radio waves, used for ship-to-ship, ship-to-shore, and emergency maritime communication. 

VHF radios are essential for marine communication, providing a reliable means of contact between vessels, harbours, marinas, and emergency services. They operate on frequencies between 156 and 174 MHz, offering clear, short-range communication that is less affected by atmospheric interference than lower-frequency radios. VHF radios are required by law on many vessels and are a primary tool for safety at sea, allowing mariners to send distress calls, receive weather updates, and coordinate navigation with other boats. 

Marine VHF radios have dedicated channels, with Channel 16 being the international distress and calling frequency. Other channels are designated for specific uses, such as port operations, ship movements, and weather broadcasts. Many modern VHF radios include Digital Selective Calling (DSC), which enables automated distress signalling with GPS location data. 

Unlike mobile phones, VHF radios provide instant communication without relying on network coverage, making them indispensable for both commercial and recreational boating.

Terms with the same meaning:
Marine Radio
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  • Signalling & Communication
  • VHF Marine Radio License Guide: Get Your UK VHF Marine Radio License

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