# Marinus: maritime rules — COLREGs, IRPCS, IALA & more!

> Maritime navigation rules, signals, and safety guidance for sailors. (iPhone/iPad app by Alejandro.)

- Source: https://appshunter.io/ios/app/marinus-maritime-rules/id536108872 (this page in markdown: same URL + `.md`)
- Developer: [Alejandro](https://appshunter.io/developer/476976572)
- Category: Education, Navigation
- Price: Free with in-app purchases
- Rating: 4.40/5 from 214 App Store ratings · 89 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 113 MB
- Languages: American English
- Released: 2012-07-04
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/marinus-maritime-rules/id536108872/reviews.md

## What is Marinus?

Not just another app for navigation rules… this is THE app for navigation rules!

Created by sailors, for sailors, Marinus COLREGs is designed to provide clear and instant answers to your questions anytime, anywhere. It's the essential app for your sailboat or motorboat.

Key Features:
• Flags – All maritime flags with their meanings.
• Meteo – Beaufort and Douglas scales, plus cloud identification.
• Sounds – Navigate safely with sound signal guidance.
• Lights – Detailed views of every vessel's navigation lights from all angles.
• Day Shapes – Learn and identify the correct day shapes for any situation.
• Maneuvers – Clear guidance on safe navigation maneuvers.
• Morse – Decode Morse signals with ease.
• Buoys (IALA) – Understand the International Buoyage System.
• Radio – Key radio communication guidelines.
• ColRegs – Full text of the International Regulations for Preventing Collisions at Sea (IRPCS).
• Quiz – Test your knowledge with interactive quizzes.
• Map – Visualize navigation concepts on an interactive map.

Access PRO Features
Unlock all PRO features with an affordable annual subscription. Your support helps us maintain and improve the app, keeping it the trusted tool for sailors around the world.

Join thousands of sailors who trust Marinus ColRegs every day on their iPhone. Whether you're an experienced seafarer or just starting your nautical journey, this is the app you’ve been looking for!

For any questions, feel free to contact us at info@marinus.es.

## Key features

- Maritime flags and meanings
- Weather scales and cloud identification
- Sound signal guidance
- Vessel navigation light diagrams
- Day shape identification
- Safe navigation maneuvers
- Morse code decoder
- IALA Buoyage System
- Radio communication guidelines
- COLREGs text

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Marinus PRO | $8.99 | per year |


## What do users think of Marinus?

Overall sentiment: negative

**Pros**

- 👍 Great app for learning
- 👍 Useful study aid
- 👍 Very helpful for mariners
- 👍 Good information provided
- 👍 Easy to use
- 👍 Smooth to use
- 👍 Great value for money (free version)
- 👍 Brilliant to have at sea
- 👍 Essential tool for students
- 👍 Good reference material
- 👍 Convenient and easy to use
- 👍 Handy for quick reference
- 👍 Solid training aid
- 👍 Useful for ROR
- 👍 Good for beginners
- 👍 Free version is good
- 👍 Covers COLREGS and Morse code

**Cons**

- 👎 Swamped with ads
- 👎 Broken app functionality
- 👎 Subscription model is a money grab
- 👎 Lifetime pro withdrawn
- 👎 Scam for changing to subscription
- 👎 Pro purchase gone
- 👎 Bad business model
- 👎 Limited content for price
- 👎 Full app is not cheap
- 👎 Too many requests to review
- 👎 Paid features are annoying
- 👎 Expensive full edition
- 👎 Lite version is limited
- 👎 Nagging pop-ups for full app
- 👎 Lights not helpful in top-down view
- 👎 Full version too expensive
- 👎 Portrait view not ideal
- 👎 Needs updating
- 👎 Missing iPhone X screen area
- 👎 Lost back navigation
- 👎 Crashing issues

**Commonly reported bugs**

- App not working, ads won't clear
- App crashes frequently
- Mistake with sounds
- App crashes after 10-15 seconds

**Most requested features**

- Settings for Buoyage A & B & combined
- Search feature
- Combine sounds and lights
- Add tides information
- More free version functionality
- More detail in maneuvers section
- Lights with silhouette and head-on/stern-on views

## Recent user reviews (10 of 89)

All indexed reviews: https://appshunter.io/ios/app/marinus-maritime-rules/id536108872/reviews.md

### 1/5 — Broken

*2026-03-06, version 5.3.1*

The app isn’t working. The first ad loads then wont clear to allow you into the material.

### 1/5 — Wouldn’t recommend

*2025-09-05*

Unfortunately this app has turned into a money grab with its subscription. 
Originally paid the full price for the app, but now it prompts me to subscribe, have tried to contact, with no response. 
Would look elsewhere for training guides as you will easily find better value.

### 1/5 — Swamped with Ads

*2025-07-12, version 5.1.7*

Absolute rubbish now as it is swamped with LONG advertising. I have deleted it.

### 1/5 — Sold Themselves Out To Google

*2025-04-07*

Never use to have ads. Can’t use it because the ads are just so thick and constant. It was good but not now.

### 5/5 — Vraiment très bien

*2025-04-06, version 5.1.7*

.

### 1/5 — Pro lifetime withdrawn, scam

*2025-03-19*

Paid for lifetime pro app as have others. Recommended it to others as it was a great app. Now asking for annual subscription which is disappointing and probably illegal. 

Gone from 5 to 1 star.

### 5/5 — awesome

*2025-03-01*

good for learning

### 1/5 — Scam

*2025-02-23*

I paid for the pro version for lifetime access, Marinus has now changed this to a subscription model, requiring me to pay yearly for access, complete scam. Great app, terrible business

### 1/5 — Voleur

*2025-02-22*

Déjà acheté la version pro et vous me l’avez retiré vous êtes des voleurs

### 1/5 — Pro no longer works and full of ads

*2025-02-11*

Pro purchase gone,

## Frequently asked questions about Marinus

### What does the Marinus app do?

Marinus is an app designed for sailors that provides comprehensive information on maritime navigation rules and safety. It covers topics like COLREGs, flags, lights, sounds, day shapes, and buoyage systems, offering clear guidance for safe navigation on sailboats and motorboats.

### What are the key features of Marinus?

Key features include detailed information on maritime flags, weather scales, sound signals, vessel navigation lights, day shapes, safe maneuvers, Morse code, the IALA Buoyage System, radio communication guidelines, and the full text of COLREGs. It also offers interactive quizzes and a map for visualizing concepts.

### How much does Marinus cost?

The app offers free features, but access to all PRO features requires an affordable annual subscription. This subscription helps support the ongoing maintenance and improvement of the app.

### What kind of devices is Marinus compatible with?

The app is available for iPhone and is trusted by thousands of sailors. Specific iOS version compatibility is not detailed, but it's designed for use on mobile devices.

### Who would benefit from using Marinus?

Marinus is ideal for anyone involved in maritime navigation, including experienced sailors and those just beginning their nautical journey. It serves as an essential tool for ensuring safe navigation and understanding international regulations.

## Version history (last 5 releases)

### 5.3.1 — 2025-12-02

New section available!
SMCP (Standard Marine Communication Phrases): you can now access standard maritime phrases in English directly from the app.

Other improvements:
• Optimized ad system for a better user experience.
• Implemented a new analytics system to keep improving the app.

### 5.3 — 2025-10-27

New section available!
SMCP (Standard Marine Communication Phrases): you can now access standard maritime phrases in English directly from the app.

Other improvements:
• Optimized ad system for a better user experience.
• Implemented a new analytics system to keep improving the app.

### 5.2.1 — 2025-09-22

We are launching the “Marinus account,” a system that allows you to use a single subscription across different devices and apps.

### 5.1.7 — 2025-03-17

Minor improvements.

### 5.1.6 — 2025-03-08

Minor improvements.

## Apps similar to Marinus

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Maritime Academy: ICS Flags](https://appshunter.io/ios/app/maritime-academy-ics-flags/id1590113271) | 4.9 (185) | Free | Education |
| [COLREG 72: safety at sea](https://appshunter.io/ios/app/colreg-72-safety-at-sea/id1010178487) | 4.8 (117) | $3.99 | Education |
| [The Nautical School ExamTutor+](https://appshunter.io/ios/app/the-nautical-school-examtutor-plus/id1309809624) | 4.1 (24) | Free | Education |
| [CES test answers 2026](https://appshunter.io/ios/app/ces-test-answers-2026/id6470131878) | 4.8 (23) | Free | Education |
| [Seabook Maritime](https://appshunter.io/ios/app/seabook-maritime/id708215141) | 4.5 (19) | Free | Education |
| [Master-Nav](https://appshunter.io/ios/app/master-nav/id1602390396) | 4.7 (94) | $1.99 | Education |

## More apps by Alejandro

- [Marinus: boating rules ColRegs / IRPCS / IALA](https://appshunter.io/ios/app/marinus-boating-rules-colregs-irpcs-iala/id476976569)
- [DragAlarm (Anchor guard)](https://appshunter.io/ios/app/dragalarm-anchor-guard/id594556110)
- [Bearing Pilot](https://appshunter.io/ios/app/bearing-pilot/id622397352)
- [WX Course](https://appshunter.io/ios/app/wx-course/id962029758)
- [Test Patrón](https://appshunter.io/ios/app/test-patron/id1048203359)

All apps by Alejandro: https://appshunter.io/developer/476976572

## Related topics

[colreg](https://appshunter.io/ios/topics/colreg) · [nautical rules](https://appshunter.io/ios/topics/nautical-rules) · [maritime](https://appshunter.io/ios/topics/maritime)

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*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 2026-08-25.*