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  • Marinus: maritime rules screenshot 1
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About Marinus: maritime rules

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 [email protected].

Ratings & reviews

4.4

215 ratings

5 ★ 64% 4 ★ 23% 3 ★ 7% 2 ★ 4% 1 ★ 2%

What’s new

Version 5.3.1 · Updated December 2, 2025

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.

App privacy

The developer, Alejandro, reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Advertising Data

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Advertising Data, Product Interaction
  • Diagnostics: Crash Data, Performance Data

Used for: Third-Party Advertising, Developer’s Advertising or Marketing, Analytics, App Functionality

Alternatives to Marinus: maritime rules

Looking for apps like Marinus: maritime rules? Here are 6 similar apps on the App Store. The highest rated is Maritime Academy: ICS Flags (4.9/5), and 4 of the 6 are free to download.

Marinus: maritime rules vs. alternatives
App Rating Price Last updated Compare
Marinus: maritime rules 4.4 / 5 (215 ratings) Free December 2, 2025
Seabook Maritime 4.5 / 5 (19) Free Apr 11, 2026 Compare
Maritime Academy: ICS Flags 4.9 / 5 (191) Free Mar 26, 2025 Compare
Master-Nav 4.8 / 5 (100) 1.99 USD Jun 15, 2026 Compare
CES test answers 2026 4.8 / 5 (23) Free Jul 1, 2026 Compare
COLREG 72: Rules of the Road 4.8 / 5 (123) 3.99 USD Oct 22, 2026 Compare
The Nautical School ExamTutor+ 4.1 / 5 (25) Free Dec 17, 2024 Compare

Compare Marinus: maritime rules with the top alternatives: ratings, updates, ASO score and keyword gaps →