Maritime Master Nav Lights

Maritime Master Nav Lights makes ship light and day shape recognition second nature. Instead of memorising flat diagrams, you explore full 3D vessels at night, orbiting around them to see exactly how each COLREG light pattern changes from dead ahead to the beam to astern.

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That aspect-by-aspect view is what turns a rule you have read into a picture you recognise at once. It is focused recognition practice you can do anywhere, in a few spare minutes.

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Every Light Pattern in 3D

Browse the complete set of COLREG lighting states: power-driven vessels underway, vessels at anchor and aground, not under command, restricted in ability to manoeuvre, mine clearance, dredging with a foul side, constrained by draught, pilot vessels, tugs towing and pushing, long tows, vessels being towed, fishing and trawling, sailing vessels, and more.

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Drag to orbit each vessel from any aspect and watch the picture change with your viewpoint. Both large and small vessel variants are modelled, so you can see how the same state looks on a coaster and on a fifty metre ship.

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Day Shapes Included

Learn the black day signals too, with 3D balls, cones, cylinders, and diamonds rigged on masts and yardarms exactly as Rules 24 to 30 describe them, all rendered in clear daylight scenes.

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Backed by the Rules

Every pattern comes with its rule number, rule title, and the relevant COLREG text, so you always know why a vessel shows what it shows, not just what it looks like.

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Test Your Recognition

Two quiz modes challenge you to identify lights and day shapes from randomised aspects, with live scoring and a results summary at the end. Short, repeatable rounds make it perfect for a few minutes of practice whenever you have them.

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Fast, Focused, Offline

No accounts, no tracking, no clutter. The app works completely offline and is built to do one job well: make you quick and accurate at recognising the light and shape patterns.

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Who It Is For

Perfect revision for OOW and deck exam candidates, yacht and day skipper students, and anyone learning the lights. For training and study only, not for real-world navigation or for identifying vessels at sea.

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Part of the Maritime Master Family

Combine it with Maritime Master COLREGs to master the rules behind the lights, Maritime Master IALA Buoyage for marks and their light characteristics, and Maritime Master OOW for the full watchkeeping picture.

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Frequently Asked Questions

Does it cover both lights and day shapes? Yes. Lights and day shapes each have their own browser and their own quiz, covering the vessel states in Rules 23 to 31.

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Is it good preparation for oral exams? Recognition from changing aspects is exactly what examiners probe, and drilling 3D vessels from every angle builds that instant recall.

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Can I use it to identify vessels at sea? No. The renders are stylised training aids. Real lights vary with weather, range, and background lighting, so always rely on proper lookout and official references.

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Get Maritime Master Nav Lights on the App Store for iPhone and iPad and never second-guess a light pattern again.