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, 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.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.
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 & TerminologyUnderstanding 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 FlashcardsFlashcards 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 BlogFrom 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.The vertical distance from a vessel’s waterline to its lowest immersed point. Also spelled “draft” in American English, draught may be measured forward, aft or at another stated position, with mean draught derived from specified readings. The lowest point may be a keel, propeller, rudder, drive leg or other projection rather than the hull shell…
A vessel or floating plant equipped to excavate or remove material from the seabed. Dredgers deepen or maintain channels and berths, recover aggregates, prepare construction sites and carry out other seabed work. Types include trailing suction hopper, cutter suction, grab and backhoe dredgers, each using different equipment and operating methods. A working dredger may be…
To move under the influence of wind, waves or water flow rather than a deliberately maintained track. A vessel can drift when stopped, disabled or intentionally allowed to move with the water, while a floating object drifts according to its windage and immersion. An anchored vessel that moves because the anchor is not holding is…
The standard spoken code word for the letter C in the international radiotelephony spelling alphabet. It is pronounced “CHAR-lee” and is used to spell names, call signs and other information clearly over marine radio. The same standard word is used in the NATO phonetic alphabet. Charlie is also associated with International Code of Signals flag…
An official or purpose-produced representation of navigable waters and adjoining areas for marine navigation. A nautical chart can show depths, drying heights, coastline, dangers, aids to navigation, routes, limits, seabed information and notes relevant to passage planning. Scale, projection, horizontal datum, vertical datum and the edition or update status determine how its information must be…
The local reference level from which charted depths and drying heights are measured.
A work surface arranged for consulting, marking and storing nautical charts and navigation records. It is usually part of a navigation station and may include chart drawers, instrument stowage, task lighting, electrical panels, radios or electronic displays. On smaller craft it may be compact, fold away or share another surface rather than accept a fully…
The vertical distance from chart datum to the seabed or the top of a charted underwater feature. Soundings printed on a nautical chart are referenced to chart datum. Adding the predicted or observed height of tide gives an estimate of the water depth at that time. The navigator then compares the result with the vessel’s…
An electronic navigation device that displays a vessel’s position on a digital nautical chart. A chart plotter combines position information, normally received from GNSS such as GPS, with an electronic chart. It can display course and speed, create waypoints and routes, and monitor progress during a passage. Depending on the installation, it may also show…
The line or area where the bottom of a hull meets its side. On a hard-chined hull, the change in angle is distinct and forms a visible edge. A multi-chine hull uses several such changes to approximate a curved form, while a soft-chined or round-bilge hull has a smoother transition without a sharp edge. The…
If you belive the Earth is flat, you're about to fall of the end...
If you belive the Earth is flat, you're about to fall of the end...
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