Master-Nav is made and published by Peterjohn Chisholm. AppBrain is an independent app data site and isn't affiliated with Peterjohn Chisholm. The app name, icon, screenshots and description belong to Peterjohn Chisholm and are shown as published on the App Store.

About Master-Nav

Master-Nav is an education app developed by Peterjohn Chisholm.

User Ratings

Master-Nav is rated 4.75 out of 5 stars. The rating is based on 100 ratings.

App Information

Master-Nav costs $1.99. The app size is 116.99 MB. The latest version available is 1.50. The last update was on June 15, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since January 2022.

Description by Peterjohn Chisholm (from the App Store)

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.

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Screenshots

Screenshots by Peterjohn Chisholm, from the the App Store listing

Official page on the App Store

Alternatives to Master-Nav

Changelog of Master-Nav

No changelog data

Developer information for Peterjohn Chisholm

Peterjohn Chisholm

Address:

Comments on Master-Nav for iOS

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App Store Rankings for Master-Nav

Top rankings

Rank	Country	Category	List
14	Canada	Education	Top Paid
7	Italy	Education	Top Paid
20	Denmark	Education	Top Paid
22	Netherlands	Education	Top Paid
27	Australia	Education	Top Paid
30	India	Education	Top Paid
51	United Kingdom	Education	Top Paid

Ranking history in Canada

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Technologies used by Master-Nav

Frequently asked questions about Master-Nav

Is Master-Nav free?

No. Master-Nav costs $1.99 on the App Store.

Is Master-Nav still available?

Yes. Master-Nav is on the App Store, and the last update we saw was on June 15, 2026.

How large is Master-Nav?

Master-Nav is 116.99 MB.

Is Master-Nav suitable for children?

App Store rates the content of Master-Nav as suitable for everyone.

How do people rate Master-Nav?

Master-Nav scores 4.75 out of 5 stars, from 100 ratings on the App Store.

Who made Master-Nav?

Master-Nav was developed by Peterjohn Chisholm. It is listed in the education category on the App Store.

What are the best alternatives to Master-Nav?

People looking at Master-Nav also look at these education apps: COLREG 72: Rules of the Road, ColRegs: Rules of the Road, IALA Buoyage & Lights, Navigation Rules, USCG Exam Prep.

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