Master-Nav

Name: Master-Nav
Rating: 4.7 (94 reviews)
Author: Peterjohn Chisholm

by Peterjohn Chisholm

iPhone

Active Last checked 31 Jul 2026

App Store ↗

Quick verdict

What it is: Store information collected; independent summary not yet available.
At a glance: $1.99

Categories and search queries

Official categories

Education
Reference

AppCorpus categories

Key functions

Function	Availability	Access	Scope	Evidence
Family Sharing	Yes	Unknown	App Store	Store published

Screens

No screenshots collected yet.

Pricing & paywalls

App Store

Shown for US

Price: $1.99

Last verified 31 Jul 2026

Ratings & reviews

App Store

Shown for US

4.7 94 ratings · App Store

5/5Great Refresher and Prep Tool
I’m getting ready to start training for my next assignment on a ship. This is an easy to use tool. I was just looking for the COLREGS test questions, but the Review modules are extremely helpful. It’s like having a high level Maritime Rules of the Road instructor on your phone.

SWO4Life · 31 Jul 2026
5/5Great for SWOs going to BDOC
I couldn’t just read COLREGS and make it stick to my brain for sheee, thank god for this app and the creators of this dynamic way of memorizing rule by rule. Because if your going to be navigating a multi million-billion dollar ship make sure you have this memorized to the T!

Youngchepe · 31 Jul 2026
3/5Great app but could be better
Great app. Please make distinction of inland/international more apparent. Also, when completing every rule please allow for resetting the progress so that I can go back and “learn.” After I finished everything there was a window congratulating me on getting through everything but when I attempted to reset, the app did not allow it. Thank you.

Brando.g88 · 31 Jul 2026
5/5Great app
Easy to navigate, easy to understand, covers all the key elements needed to prep for the exam.

NicC1975 · 31 Jul 2026

Privacy & accessibility

App Store

Privacy

Data Not Collected Developer declared

Accessibility

No accessibility labels collected yet.

Versions

App Store

1.26
-General performance and stability improvements.
1.27
-General performance and stability improvements.
1.28
-General performance and stability improvements.
1.29
-General performance and stability improvements.
1.30
General performance and stability improvements.
1.31
Improved overall performance and stability. Flashing light animations for Air-cushion vessels and WIG Craft now operate at the correct speed for enhanced accuracy and realism.
1.32
What’s New • The Skip button now skips individual questions instead of whole sections — more control, less hassle! • Minor fix to the COLREGs introduction: graphics now correctly show Annexes I–V instead of I–IV.
1.33
• The Skip button now skips individual questions instead of whole sections — more control, less hassle! • Minor fixes.
1.34
Minor fixes and improvements.
1.35
Minor fixes and improvements.
1.36
Major Part C update. Improved explanations for fishing, pilot, mine clearance, aground and anchor situations, with clearer guidance on length, aspect and exam style wording. Plus some performance and layout improvements.
1.37
Major Part C update. Improved explanations for fishing, pilot, mine clearance, aground and anchor situations, with clearer guidance on length, aspect and exam style wording. Plus some performance and layout improvements.
1.38
Major Part C update. Improved explanations for fishing, pilot, mine clearance, aground and anchor situations, with clearer guidance on length, aspect and exam style wording. Plus some performance, layout improvements and bug fixes.
1.39
You can now adjust text size and brightness for easier reading. New toggle to skip confirmation prompts when skipping questions. Cleaner, smoother interface with improved spacing and responsiveness.
1.40
You can now adjust text size and brightness for easier reading. New toggle to skip confirmation prompts when skipping questions. Cleaner, smoother interface with improved spacing and responsiveness. Bug fixes - some views not displaying correctly.
1.41
Bug fixes, and interface improvements.
1.42
Bug fixes, and interface improvements.
1.43
Major update — Part D: Sound & Light Signals now fully integrated. New interactive graphics, exam questions and comprehensive coverage of sound signals, light signals and their applications. As always, further UI refinements and performance improvements throughout.
1.44
Major update — Part D: Sound & Light Signals now fully integrated. New interactive graphics, exam questions and comprehensive coverage of sound signals, light signals and their applications. As always, further UI refinements and performance improvements throughout
1.45
Improved interface and performance enhancements for a better study experience.
1.46
Improved learn screens throughout the app — key rules now feature improved illustrated cards with clear visual explanations.
147
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.
1.48
Improved navigation-light graphics and animations on the vessel identification questions, plus a few display fixes and refinements.
1.49
This update refreshes the introduction section with clearer, updated illustrations and fixes a handful of small display issues. Thanks for using MasterNav!
1.50 · 15 Jun 2026
New improved artwork and content, minor bug fixes.

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Alternatives

Shellback — Same category + similar ratings

Availability by market

No LIVE observation for GB yet.

Data quality & evidence

Page completeness: Live store listing
Last verified: 31 Jul 2026
Sources: App Store

Independent summary has not been published yet.
Screenshots: not yet collected

Report a correction

Use this page with an AI agent

AppCorpus MCP gives your agent current app data, prices, screens, features and sources.

Example prompt

Compare Master-Nav with Shellback.

View JSON

GET /api/v3/apps/1602390396

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