Interrupted Quick-flashing Light (IQ)
Has a quick sequence broken by regularly repeated longer dark intervals.
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.
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 chart abbreviations are like the secret code of the seas—except instead of buried treasure, they lead to rocks, buoys, and mysterious dashed lines that scream, ‘Don’t sail here.’ Learning them can feel like cracking a pirate’s encrypted diary, but don’t worry, matey! With clever tools, quirky mnemonics, and a splash of humour, we’ll help you go from ‘What’s “FOUL” mean? to confidently navigating the “Wk” wrecks and “Fl G” flashes like a salty sea captain. Think of it as Rosetta Stone, but for avoiding sandbanks!
Has a quick sequence broken by regularly repeated longer dark intervals.
Has a very-quick sequence broken by regularly repeated longer dark intervals.
Has an ultra-quick sequence broken by regularly repeated longer dark intervals.
Combines a steady fixed light with a flashing light of greater luminous intensity.
A compact description of a light.
Uses numbers in brackets to show how many flashes or eclipses form each repeating group.
The standard colour codes are W for white, R for red, G for green, Bu for blue, Vi for violet, Y for yellow, Am for amber and Or for orange.
An arc in which the light is not visible or is intentionally screened.
An arc in which the light is shown with greater luminous intensity than in adjacent sectors.
An arc in which the light has less intensity than its intensified sector.
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...
Our 1% commitment
My Sailing Course contributes 1% of every Stripe payment to help promising carbon removal technologies move from the lab into the field.
Stripe Climate commitments fund the development and purchase of carbon removal. They are not carbon offsets or credits attached to an individual order.
Welcome to My Sailing Course. Where's this adventure going to take you?
Ahoy there, Visiting Sailor! Ask us anything—whether you need help choosing a course, have a sailing question, or want to speak to the crew.
Scan with your phone to open the My Sailing Course WhatsApp service. You can review or edit the prepared message before sending it.
Your conversation stays with My Sailing Course so our Support team can respond securely.
Enter at least two characters to explore.
Welcome back aboard. Sign in with the email address connected to your My Sailing Course account.
Your account details are encrypted in transit and your password is never displayed or stored by this form. By continuing, you agree to our Terms & Conditions and acknowledge our Privacy Policy.
Join free to save your favourites, unlock bonus learning resources and keep everything nautical close at hand.
Join the My Sailing Course community with one secure account for your courses, profile and support.
We've successfully created your account. Hold station for a few moments and you will be returned to the page.
Already have an account? Sign in
Enter your account email and we will send you a secure reset link.
This reset link is invalid or has expired.
Your new password is saved securely. We are confirming it across My Sailing Course before you sign in.
Please keep this window open. It will change to the sign-in form as soon as every service confirms the update.