Master-Nav

1.50

Peterjohn Chisholm

4.75

92 reviews

$1.99

Download from the App Store

About Master-Nav

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

Download Statistics

User Ratings

Master-Nav is rated 4.75 out of 5 stars. The rating is based on 92 ratings.

App Information

Master-Nav costs $1.99 to download. The APK 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 Google Play 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	4.75 based on 92 ratings
Ranking	Highly 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

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App Store Rankings for Master-Nav

Top rankings

Rank	Country	Category	List
81	United States	Education	Top Paid
59	Germany	Education	Top Paid
36	United Kingdom	Education	Top Paid
50	Brazil	Education	Top Paid
81	Iran	Education	Top Paid

Ranking history in United States

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Technologies used by Master-Nav

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