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.Signals and communication in the marine world are like a game of charades with the ocean as your stage. Picture a crew furiously waving flags screaming, “We’re out of snacks!” while another ship squints, trying to decode whether that’s a distress call or just terrible semaphore skills. Horns blast at decibels high enough to wake Poseidon, with meanings ranging from “I’m turning left” to “Move it or lose it!” And let’s not forget Morse code—nothing says “urgent message” like blinking a flashlight at a seagull for hours. Meanwhile, the VHF radio crackles with static and a dozen accents yelling about the weather, leaving everyone more confused than enlightened. It’s a symphony of organised chaos where somehow, miraculously, no one crashes into an iceberg. Usually.
A dimensionless GNSS geometry factor describing how ranging errors are amplified in the vertical component of a position fix. VDOP depends on the distribution of the satellites used in the solution. Because satellites are normally visible above rather than below the receiver, vertical geometry is often weaker than horizontal geometry and altitude uncertainty may be…
A dimensionless GNSS geometry factor describing how ranging errors are amplified in the receiver-clock estimate. A GNSS receiver solves for its clock offset as well as position because its clock is not synchronised as precisely as the satellites’ atomic clocks. TDOP expresses the geometric contribution to uncertainty in that time solution. Lower TDOP generally indicates…
A dimensionless GNSS geometry factor combining three-dimensional position and receiver-clock uncertainty. GDOP reflects how the relative positions of the satellites used in a solution amplify common ranging errors across latitude, longitude, height and time. It combines position dilution of precision and time dilution of precision, commonly by a root-sum-square relationship. Low GDOP indicates favourable satellite…
A standard set of code words used to transmit letters clearly when speech may be misunderstood. In marine radiotelephony, letters are spoken as words such as Alfa, Bravo, Charlie and Delta. The system reduces confusion between similar-sounding letters when spelling vessel names, call signs, coordinates and other important information over a noisy or weak radio…
A buoy, platform or other installation that gathers and often transmits oceanographic or meteorological observations.
An unmanned, self-propelled submersible that carries out a programmed mission without a continuous control link. An AUV uses onboard navigation, sensors, power and control systems to survey or inspect beneath the surface. Typical work includes hydrographic mapping, scientific sampling, pipeline and cable inspection, mine countermeasures and search operations. Unlike a remotely operated vehicle, an AUV…
A type-approved shipborne navigation system meeting IMO performance standards for displaying official electronic chart data and supporting route planning and monitoring. With adequate backup arrangements and up-to-date official chart data, ECDIS can satisfy applicable SOLAS chart-carriage requirements. It integrates position and other sensor information with chart objects, safety contours, route checks, alarms and official updates….
The predicted time remaining until two moving objects reach their calculated closest point of approach if their motions remain unchanged. TCPA is derived with closest point of approach from relative position and velocity, using radar plotting, ARPA, AIS or other tracking. A positive value normally indicates the CPA is ahead in time; a negative value…
An official publication announcing corrections or information affecting nautical charts and navigational publications. Notices can provide permanent chart corrections, temporary or preliminary information, publication amendments and details of new or changed aids and hazards. Numbering, frequency, format and correction procedure depend on the issuing hydrographic office or competent authority. A notice must be matched to…
A bearing expressed by a named cardinal or intercardinal direction rather than by degrees. The four cardinal directions are north, east, south and west; intercardinal and secondary-intercardinal points divide the compass further. A named bearing can be true, magnetic or compass-referenced, and that reference must be stated when it matters. Cardinal wording is useful for…
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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