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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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Published:25th October 202419th March 2025 Last Updated:19th March 2025
General Nautical Terminology

Flares

A pyrotechnic device used on boats to signal distress or indicate position, especially in emergencies.

Flares are an essential part of marine safety equipment, designed to attract attention in emergency situations at sea. They are typically used when a vessel is in distress, such as when it’s sinking, disabled, or in need of immediate assistance. Flares come in various types, including hand-held, parachute, and smoke flares, each serving different purposes depending on the situation and time of day. Hand-held flares produce a bright light and are often used at night or in low-visibility conditions, while parachute flares are fired into the sky and descend slowly, making them visible over long distances. Smoke flares, on the other hand, are used during daylight hours and emit a thick, coloured smoke that can be seen from afar.

Flares are regulated by maritime authorities, and vessels are often required to carry a certain number and type of flares depending on their size and the waters they navigate. It’s important to note that flares have an expiration date and must be replaced regularly to ensure they function properly when needed. Improper use or disposal of flares can be dangerous, as they contain combustible materials. In addition to flares, modern vessels may also carry electronic distress signals, but traditional pyrotechnic flares remain a reliable and widely recognised method of signalling distress at sea.

Overview of flares and their uses

The table below outlines the different types and colours of flare and a brief description of their use.

TypeColourUse
Parachute FlareRedIndicating your distress when out of sight of other vessels. Rocket flares should be launched in pairs, approximately 1 to 2 mins apart. 
 WhiteIlluminating a sea area. Useful if searching for a man overboard at night.
Hand-held FlareOrange (smoke)Providing directional guidance and wind indication for any search and rescue assets as they approach you.
 RedInidicating your distress when other vessels are nearby. Useful to hold the flare in the direction of potential help.
 WhitePinpoint indication of your location making visible your position. Used if you don’t believe a vessel on a collision course has seen you.
Buoyant FlareOrange (smoke)Providing directional guidance and wind indication for any search and rescue assets as they approach you.
Related Content:
  • Life Saving Signals Table
  • SOLAS No.2 Life Saving Signals Card

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