# Marine Nav Lights Trainer — COLREG rules revision

> COLREG rules revision (iPhone/iPad app by Kai Mattern.)

- Source: https://appshunter.io/ios/app/marine-nav-lights-trainer/id6757606955 (this page in markdown: same URL + `.md`)
- Developer: [Kai Mattern](https://appshunter.io/developer/1863017911)
- Category: Education, Reference
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.6 · 45 MB
- Languages: British English, European Spanish
- Released: 2026-01-27
- Data updated: 2026-08-11
- User reviews in markdown: https://appshunter.io/ios/app/marine-nav-lights-trainer/id6757606955/reviews.md

## What is Marine Nav Lights Trainer?

Master COLREGs navigation lights and day shapes with a professional spaced-repetition trainer designed for both real exams and real-world navigation.

This app is a focused educational and revision tool for sailors, skippers, and maritime students who want an efficient way to learn, retain, and periodically refresh their understanding of the International Regulations for Preventing Collisions at Sea (COLREGs).

It is designed for serious learners — including professional and advanced recreational mariners — who want a clear, distraction-free way to revisit complex rules, lights, shapes, and scenarios.

Designed for long-term retention

The app presents key COLREGs concepts in a structured, study-oriented format.
By combining visual recognition with active recall and spaced repetition, it helps reinforce knowledge over time — making it suitable not only for exam preparation, but also for regular refresher use (for example every 6–12 months).

Key features

• Structured review of COLREGs navigation lights and shapes
• Clear visual presentation of lights, shapes, and signals
• Question-and-answer format to actively test understanding
• Study, practice, and exam-style learning modes
• Progress tracking stored locally on your device
• Fully offline use after installation
• No accounts, no ads, no tracking

Built for focused study

This app is intentionally simple and distraction-free.
There are no advertisements, no subscriptions, and no internet dependency — just a reliable study tool you can use anywhere, anytime.

Important notice

This app is for training and revision purposes only.
It does not provide real-time navigation assistance, operational decision-making, or situational awareness, and it does not replace official publications, onboard instruments, or professional judgment.

You remain fully responsible for safe navigation and compliance with applicable regulations at all times.

## Chart rankings

- #187 in Top Paid · Education (US App Store)


## Version history (last 3 releases)

### 2.1.0 — 2026-03-07

Study mode now has explanation texts for the different vessel types for quick revision

### 2.0.0 — 2026-02-28

English and Spanish version, improved learning logic

### 1.0.0 — 2026-01-28

No release notes.

## More apps by Kai Mattern

- [Marine Rules of the Road](https://appshunter.io/ios/app/marine-rules-of-the-road/id6757630383)
- [Marine IALA A Buoyage Trainer](https://appshunter.io/ios/app/marine-iala-a-buoyage-trainer/id6757633608)
- [IALA buoyage B Trainer](https://appshunter.io/ios/app/iala-buoyage-b-trainer/id6758349165)
- [Weather Trainer App](https://appshunter.io/ios/app/weather-trainer-app/id6758983478)

All apps by Kai Mattern: https://appshunter.io/developer/1863017911

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*