Nav Rules: COLREGS Quiz
Boat Lights & Give-Way Trainer
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Read the lights at night and know who gives way. Quiz yourself on nav lights and encounters, then check the rule behind every answer.
See a cluster of lights across dark water and instantly know what that vessel is — and who has to give way. Nav Rules turns the COLREGS rules of the road into a quiz you can actually practice, from night light identification to give-way encounters.
▶ NIGHT LIGHT ID QUIZ — a rendered silhouette shows the lights and shapes of a vessel; you name the type. Powered, sailing, towing, fishing, anchored, restricted and more.
▶ GIVE-WAY ENCOUNTER ENGINE — set two vessels at any relative angle and the app tells you which is give-way and which is stand-on, with the exact rule number behind it.
▶ RULE REFERENCE — plain-language summaries of the key steering and sailing rules, plus lights and shapes, available offline.
▶ SOUND SIGNALS — the whistle and horn signals for maneuvers, overtaking and restricted visibility, in one quick reference.
▶ FULLY OFFLINE — everything works without a signal, out on the water or studying at the dock. No account.
Great for boaters brushing up, license and exam candidates, sailing students and anyone who wants to read the water at night with confidence.
IMPORTANT: This app is a study aid and reference, not for actual navigation. It is not a substitute for the official rules, proper training or a qualified lookout. Always consult the current official COLREGS and follow the direction of a competent authority when underway.
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Alerts now arrive properly on Android instead of landing silently, and the app no longer interrupts you in the middle of what you came to do.
The developer, heekyung moon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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- Identifiers
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The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- heekyung moon
- Size
- 53.7 MB
- Category
- Navigation
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © 2026 Moon