Ten years old and wants to drive
Short, clear and fun. The rules stick because you've been there.
Right of way · COLREGS · Boating licence
Learn the rules of the road at the helm.
Sjöklart puts you in real encounters on the water, in 3D. You decide, watch what happens, and get the rule explained — with the paragraph to back it up. Fun enough for a ten-year-old. Rigorous enough for your licence.
- Free to practise
- No ads
- No account
Course 034°250°
Who gives way?A power vessel is crossing from starboard. You steer.
COLREGS · Rule 15Correct
Crossing: give way to the vessel on your starboard side.
- ✓Right manoeuvre+34°
- ✓In ample time0,6 M
How it works
Four steps. Thirty seconds.
No multiple choice and no rulebook to memorise. You learn the way you learn on the water: by reading the situation and making a call.
- 01
Read the situation
Another vessel appears. Wind, heading and speed are all there — just like on the water.
- 02
Steer
Take the helm. Give way early and clearly — or hold your course if that's your job.
- 03
Watch it play out
The boats keep moving. The right call gives a clean pass. The wrong one shows immediately.
- 04
Understand the rule
A short, plain-language explanation, with a reference to the rule it rests on.
Try it · The real game
Take the helm.
This is Sjöklart, right in your browser. Steer for the yellow mark. When another vessel appears, you decide what the rules require — and the chart alongside shows exactly how it went.
Free sailing · about 2 minutes
Pick a boat and cast off.
Needs WebGPUThe sea needs WebGPU.
The 3D game needs WebGPU: Chrome, Edge or Safari 26 or later. This browser doesn't draw the water yet, so the boats end up on empty sky.
Try anywayLoads the game (about 5 MB). Works best in Chrome, Edge and Safari.Launching…
Course 000°—
Encounter 0 / 0
MarkSteer for the yellow mark.
PausedThe sea will wait for you.Press Space to pause and resume.
Assessment
Correct. Not roughly.
An encounter doesn't pass just because you turned the right way. Sjöklart grades what the rules actually require: that you acted in ample time, clearly, and at a safe distance.
- Basis
- The International Regulations for Preventing Collisions at Sea, COLREGS. Every explanation cites the rule it rests on.
- Swedish rules
- Additions from the Swedish Sjötrafikförordningen come as a separate layer.
- Mistakes
- Aren't punished. You see why — and try again straight away.
Debrief · Encounter 4
3 of 4Flawed pass
- ✓Right manoeuvreYou did what the rule required.STB
- ✓In ample timeEarly enough to be seen and understood.0,6 M
- ~Readily apparentThe turn read as intent, but not as a clear change of course.+12°
- ✓Safe distanceYou passed at a safe distance.0,21 M
COLREGS · Rule 8 · 16Hold the helm until you've turned about 20°.
Module 1 · Right of way
What you'll know afterwards.
Power against power, sail against sail and everything in between — from the most common encounter to the exceptions the exam likes to ask about.
- 14Head-onBoth alter to starboard
- 15CrossingGive way to the vessel on your starboard
- 13OvertakingThe overtaking vessel keeps clear
- 17Stand-on vesselHold course and speed — and act if you must
- 18ResponsibilitiesPower gives way to sail
- 12a(i)Opposite tacksPort tack gives way
- 12a(ii)Same tackWindward gives way to leeward
- 9Narrow channelsDon't impede a vessel confined to the channel
Free sailing
Then you take the helm yourself.
Once the rules stick, leave the drills behind. Steer from mark to mark, meet the traffic that turns up, and get a debrief of every encounter when the voyage is over.
Who it's for10 § ’98
Studying for a licence
Right of way is where it's easiest to get it wrong. Practise here until it's second nature.
Got the licence long ago
Refresh what you once learned, in ten minutes, before the season starts.
Modules
Right of way first.
Then we keep building the same way: learn by doing, with the rules as the foundation.
01First up
Right of way
Who gives way to whom — power, sail and the exceptions.
02Coming
Navigation marks
Lateral marks, cardinals and fixed marks.
03Coming
Lights & signals
Recognise vessels in the dark and what signals mean.
04Coming
Charts
Symbols, depths and scale on a nautical chart.
05Coming
Navigation
Course, distance and speed–time–distance.
06Coming
Weather
Wind, visibility and reading a forecast.
Pricing
Free to practise. One purchase for the rest.
Free
0 kr forever
The full right-of-way practice module.
- Every encounter, with rule explanations
- Free sailing by motorboat and sailboat
- Progress saved on your device
- Swedish and English
- No ads, no account
Sjöklart Komplett
One-time149 kr once
Buy once, get everything we build.
- Everything in Free
- Exam mode for motorboat and sailboat
- Every new module as it ships
- Marks, lights, charts and more
Schools, clubs & organisations
Get in touch →Use Sjöklart in your teaching.
Per-student licences for instructors and course providers, or your own version under your name.
Questions
Good to know.
Is Sjöklart enough to pass the licence exam?
No, and we don't claim it is. Sjöklart trains the right-of-way rules — the part where it's easiest to go wrong. Combine it with a course or textbook for the rest.
Which rules is it based on?
The International Regulations for Preventing Collisions at Sea (COLREGS). Every explanation names the rule it rests on. Swedish additions from Sjötrafikförordningen come as a separate layer.
Do I need an account?
No. Your progress is saved on your device. No sign-in, no ads.
Is it suitable for kids?
Yes. Each encounter takes a few seconds and the language is simple. Mistakes aren't punished — you see why and try again.
When is the app coming?
An open beta starts this winter. Launch on the App Store, Google Play and the web in March 2027 — in time for spring study season.
Beta · winter 2026
Be sea-ready by spring.
Leave your email and we'll let you know when the beta opens. Nothing else.
Thanks! We'll be in touch when the beta opens.