Master-Nav

1.50

Peterjohn Chisholm

4.74

98 reviews

$1.99

Download from the App Store

About Master-Nav

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

User Ratings

Master-Nav is rated 4.74 out of 5 stars. The rating is based on 98 ratings.

App Information

Master-Nav costs $1.99 to download. The download 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

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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More data about Master-Nav

Price	$1.99
Rating	4.74 based on 98 ratings
Ranking	Top ranked
Version	1.50
App download size	117.0 MB
Suitable for	Everyone

Alternative downloads for the Master-Nav app

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
11	Australia	Education	Top Paid
50	United States	Education	Top Paid
99	France	Education	Top Paid
50	Iran	Education	Top Paid
70	United Kingdom	Education	Top Paid

Ranking history in Australia

Ranking history

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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 the Master-Nav download?

Master-Nav is 116.99 MB to download.

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 4.74 out of 5 stars, from 98 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: safety at sea, ColRegs: Rules of the Road, IALA Buoyage & Lights, Navigation Rules, USCG Exam Prep.

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