# Master-Nav — NAV RULES - the easy way! > Interactive system for learning and retaining maritime navigation rules. (iPhone/iPad app by Peterjohn Chisholm.) - Source: https://appshunter.io/ios/app/master-nav/id1602390396 (this page in markdown: same URL + `.md`) - Developer: [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) - Category: Education, Reference - Price: $1.99 - Rating: 4.70/5 from 94 App Store ratings · 32 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 117 MB - Languages: American English - Released: 2022-01-08 - Data updated: 2026-08-29 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/master-nav/id1602390396/reviews.md ## What is Master? Master-Nav is a progressive COLREGS learning system developed by a Master Mariner. The COLREGS are notoriously difficult to learn and retain — Master-Nav makes it significantly easier through an interactive system built around how your brain actually works. Instead of guessing through random question banks, Master-Nav guides you step by step through every rule from start to finish. Wrong answers are revisited until the rules stick — properly. Complex regulations are broken down into learnable chunks — bite-sized sections supported by mnemonics, memory aids and interactive visuals designed around how the brain actually retains information. Every incorrect answer is shown graphically alongside the correct one — immediately clear, no confusion. And with a single tap, the relevant COLREGS rule is accessible from any question at any time. Master-Nav covers COLREGS Parts A to D — General, Steering & Sailing, Lights & Shapes and Sound & Light Signals — plus Annex IV Distress Signals. Over 1000 questions in multiple formats, with a dedicated Practice Section that tracks right, wrong and unanswered so you always know where to focus. COLREGS — the easy way. ## Key features - Interactive learning system - Step-by-step rule guidance - Mnemonics and memory aids - Interactive visuals - Graphical feedback on answers - Practice section with progress tracking ## Recent user reviews (10 of 32) All indexed reviews: https://appshunter.io/ios/app/master-nav/id1602390396/reviews.md ### 5/5 — Cramming for YM costal *2026-06-10, version 1.49* Seems a good way to learn. Likening the format. ### 5/5 — Highly recommended *2026-06-07, version 1.49* I’ve used this extensively while preparing for RYA Coastal Skipper theory, and found it excellent, very useful and good value. The IALA and Test apps are very good too. ### 5/5 — Unreal *2026-04-28, version 147* Get this for learning your colregs ### 5/5 — Day Skipper Theory *2026-04-19, version 147* Brilliant App for learning so much knowledge with good educational practice of retrieval and interleaving of previous info. Great for micro learning. ### 5/5 — Excellent for studying *2026-02-17, version 1.42* Relevant questions with realistic multiple choice. Imagines for lights are good quality. All positive feedback for this app, tried out 3-4 and this is the best by far for cost and effectiveness. ### 5/5 — Really helpful app *2026-02-03, version 1.40* I’m only doing my Day Skipper theory but this app is helping the Colregs go in and stick much faster than the usual flash cards or trying to read it all through. It helps you to understand the rules by breaking them down one by one - in whichever order you choose - and then gives you the practice opportunity to reinforce what you’ve just learned. Great for a quick ten minutes or a longer session. I don’t need to know them all yet so I can concentrate on the ones I need for the theory exam and as I progress I will definitely use this app to build on my knowledge. ### 5/5 — Great app ❤️ *2026-01-20, version 1.38* Informative and Challenging- great learning tool and testing your knowledge. Easy to follow with scoring capabilities to monitor your progress.Great app ### 5/5 — Highly recommended *2025-12-05, version 1.35* If you need to learn the rules of the road then get this app ### 5/5 — How to i get the very first page again *2025-09-19, version 1.35* There was a first page about all the colregs 1-4 , 4-18 i dont see it anymore ### 5/5 — The best *2025-09-13, version 1.35* This is the best app for learning Colregs guys, I highly recommend it👏. ## Frequently asked questions about Master ### What is Master-Nav? Master-Nav is a learning system designed to make understanding and retaining the COLREGS (International Regulations for Preventing Collisions at Sea) easier. It uses an interactive approach with mnemonics, visuals, and targeted practice to help users learn the rules effectively. ### What rules does Master-Nav cover? The app covers COLREGS Parts A to D, which include General, Steering & Sailing, Lights & Shapes, and Sound & Light Signals. It also includes Annex IV, which covers Distress Signals. There are over 1000 questions in various formats. ### How does Master-Nav help with learning? It breaks down complex regulations into bite-sized chunks, uses mnemonics and visual aids designed for memory retention, and revisits incorrect answers until they are mastered. Incorrect answers are shown graphically alongside the correct ones for immediate clarity. ### Is Master-Nav free to use? Based on the provided information, Master-Nav is a paid application. It does not have in-app purchases or advertisements, indicating a one-time purchase model for full access. ### Who is the target audience for Master-Nav? This app is ideal for anyone who needs to learn or refresh their knowledge of the COLREGS, including Master Mariners, maritime students, professional sailors, and recreational boaters who operate in international waters. ## Version history (last 5 releases) ### 1.50 — 2026-06-15 New improved artwork and content, minor bug fixes. ### 1.49 — 2026-06-07 This update refreshes the introduction section with clearer, updated illustrations and fixes a handful of small display issues. Thanks for using MasterNav! ### 1.48 — 2026-05-31 Improved navigation-light graphics and animations on the vessel identification questions, plus a few display fixes and refinements. ### 147 — 2026-04-11 Rule 18 rebuilt: new drag-to-reorder question format, clearer explanations with new diagrams for NUC, RAM, seaplanes and WIG craft, a dedicated breakdown of the "so far as possible" qualifier, and 27 new practice questions. ### 1.46 — 2026-04-01 Improved learn screens throughout the app — key rules now feature improved illustrated cards with clear visual explanations. ## Apps similar to Master | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sea Trials - USCG License Exam](https://appshunter.io/ios/app/sea-trials-uscg-license-exam/id1362793782) | 4.7 (378) | 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 | | [Maritime Academy: ICS Flags](https://appshunter.io/ios/app/maritime-academy-ics-flags/id1590113271) | 4.9 (185) | Free | Education | | [Seabook Maritime](https://appshunter.io/ios/app/seabook-maritime/id708215141) | 4.5 (19) | Free | Education | | [USCG Exam Prep](https://appshunter.io/ios/app/uscg-exam-prep/id1579535924) | 3.4 (10) | Free | Education | ## More apps by Peterjohn Chisholm - [Master-Nav: IALA MBS](https://appshunter.io/ios/app/master-nav-iala-mbs/id6757947717) - [Master-Nav: COLREGS IALA Tests](https://appshunter.io/ios/app/master-nav-colregs-iala-tests/id6758554000) All apps by Peterjohn Chisholm: https://appshunter.io/developer/1602390398 ## Related topics [nav rules](https://appshunter.io/ios/topics/nav-rules) · [uscg exam prep](https://appshunter.io/ios/topics/uscg-exam-prep) --- *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 2026-08-29.*