---
title: "Master-Nav: Colregs - Reviews, Revenue and Downloads in Singapore | Apple App Store"
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 inter"
---

# Master-Nav: Colregs — Singapore
> COLREGS - the easy way!

![Master-Nav App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/52/a3/99/52a3993b-728b-b64b-dd7d-c3c6a4161325/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Peterjohn Chisholm](https://apptail.io/developer/peterjohn-chisholm-xgab)
**Category:** Education
**Rating:** 5.0/5 (1 ratings)
**Price:** Free
**Bundle ID:** eu.pjcc.NavMaster
**Store:** Apple App Store
**Country:** Singapore
**Version:** 1.46 (released 2026-04-01)
**Original Release:** 2022-01-08
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/sg/app/app/id1602390396)
**AppTail Page:** [https://apptail.io/app/master-nav-VYXc/singapore](https://apptail.io/app/master-nav-VYXc/singapore)

## Master-Nav 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.

## Master-Nav Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/db/05/bc/db05bc7a-3949-9811-c915-e72d8216313b/01.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/7f/f6/c7/7ff6c7e3-b109-c096-957e-ddb0a0650b8b/03.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/87/84/37/87843798-ee24-9ebc-d99c-0aa16e197150/03.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/b1/71/dd/b171dd94-afbb-577c-1386-89b6e974fc23/05.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/4f/2b/c3/4f2bc366-fbcb-13f1-31e5-ba1a81a4367a/09.png/1284x2778.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/52/1b/9d/521b9d28-8db5-9136-63ff-a71a7f5122b8/07.png/1284x2778.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d2/a2/c8/d2a2c897-a46d-e47c-9228-7e6bc773f233/02.png/1284x2778.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/80/fc/3f/80fc3f9c-2ac2-333d-5017-c43ce41f31b5/06.png/1284x2778.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/ea/47/82/ea4782a6-b609-651c-29d7-dc59cb23e0a7/08.png/1284x2778.png)

## Master-Nav Rating Breakdown in Singapore
- 5 stars: 1 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)



## Master-Nav Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Philippines | Education | #4 |
| Top Paid | Ireland | Education | #13 |
| Top Paid | Australia | Education | #13 |
| Top Paid | United Arab Emirates | Education | #13 |
| Top Paid | Saudi Arabia | Education | #14 |
| Top Paid | Czechia | Education | #17 |
| Top Paid | Romania | Education | #18 |
| Top Paid | Philippines | Overall | #22 |
| Top Paid | United Kingdom | Education | #60 |
| Top Paid | Canada | Education | #64 |
| Top Paid | South Africa | Education | #79 |
| Top Paid | Ireland | Overall | #88 |
| Top Paid | Saudi Arabia | Overall | #101 |
| Top Paid | Romania | Overall | #103 |
| Top Paid | United States | Education | #113 |
| Top Paid | Greece | Education | #122 |
| Top Paid | United Arab Emirates | Overall | #130 |
| Top Paid | India | Education | #140 |
| Top Paid | Nigeria | Education | #141 |
| Top Paid | Czechia | Overall | #148 |
| Top Paid | Australia | Overall | #157 |
| Top Paid | Singapore | Education | #178 |
| Top Paid | Ukraine | Education | #188 |
| Top Paid | Malaysia | Education | #230 |
| Top Paid | Belgium | Education | #330 |
| Top Paid | United Kingdom | Overall | #338 |
| Top Paid | Poland | Education | #339 |
| Top Paid | Finland | Education | #358 |
| Top Paid | New Zealand | Education | #383 |
| Top Paid | Hungary | Education | #386 |
| Top Paid | Egypt | Education | #414 |
| Top Paid | Spain | Education | #417 |
| Top Paid | Netherlands | Education | #426 |
| Top Paid | Italy | Education | #458 |
| Top Paid | Indonesia | Education | #461 |


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## Master-Nav Available In
- [United Kingdom](https://apptail.io/app/master-nav-VYXc/united-kingdom)
- [United States](https://apptail.io/app/master-nav-VYXc/united-states)
- [Australia](https://apptail.io/app/master-nav-VYXc/australia)
- [Canada](https://apptail.io/app/master-nav-VYXc/canada)
- [South Africa](https://apptail.io/app/master-nav-VYXc/south-africa)
- [France](https://apptail.io/app/master-nav-VYXc/france)
- [Philippines](https://apptail.io/app/master-nav-VYXc/philippines)
- [India](https://apptail.io/app/master-nav-VYXc/india)
- [Germany](https://apptail.io/app/master-nav-VYXc/germany)
- [Italy](https://apptail.io/app/master-nav-VYXc/italy)
- [Sweden](https://apptail.io/app/master-nav-VYXc/sweden)
- [Spain](https://apptail.io/app/master-nav-VYXc/spain)
- [Malaysia](https://apptail.io/app/master-nav-VYXc/malaysia)
- [Netherlands](https://apptail.io/app/master-nav-VYXc/netherlands)
- [United Arab Emirates](https://apptail.io/app/master-nav-VYXc/united-arab-emirates)
- [New Zealand](https://apptail.io/app/master-nav-VYXc/new-zealand)
- [Hungary](https://apptail.io/app/master-nav-VYXc/hungary)
- [Finland](https://apptail.io/app/master-nav-VYXc/finland)
- [Greece](https://apptail.io/app/master-nav-VYXc/greece)
- [Czechia](https://apptail.io/app/master-nav-VYXc/czechia)
- [Thailand](https://apptail.io/app/master-nav-VYXc/thailand)
- [Türkiye](https://apptail.io/app/master-nav-VYXc/turkey)
- [Ukraine](https://apptail.io/app/master-nav-VYXc/ukraine)
- [Austria](https://apptail.io/app/master-nav-VYXc/austria)
- [Argentina](https://apptail.io/app/master-nav-VYXc/argentina)
- [Singapore](https://apptail.io/app/master-nav-VYXc/singapore)
- [Egypt](https://apptail.io/app/master-nav-VYXc/egypt)
- [Norway](https://apptail.io/app/master-nav-VYXc/norway)
- [Switzerland](https://apptail.io/app/master-nav-VYXc/switzerland)
- [Mexico](https://apptail.io/app/master-nav-VYXc/mexico)
- [Brazil](https://apptail.io/app/master-nav-VYXc/brazil)
- [Taiwan](https://apptail.io/app/master-nav-VYXc/taiwan)
- [Kenya](https://apptail.io/app/master-nav-VYXc/kenya)
- [Malta](https://apptail.io/app/master-nav-VYXc/malta)
- [Vietnam](https://apptail.io/app/master-nav-VYXc/vietnam)
- [Poland](https://apptail.io/app/master-nav-VYXc/poland)
- [Belgium](https://apptail.io/app/master-nav-VYXc/belgium)
- [Bulgaria](https://apptail.io/app/master-nav-VYXc/bulgaria)
- [Russia](https://apptail.io/app/master-nav-VYXc/russia)
- [Ireland](https://apptail.io/app/master-nav-VYXc/ireland)
- [North Macedonia](https://apptail.io/app/master-nav-VYXc/north-macedonia)
- [Azerbaijan](https://apptail.io/app/master-nav-VYXc/azerbaijan)
- [Brunei](https://apptail.io/app/master-nav-VYXc/brunei)
- [Belarus](https://apptail.io/app/master-nav-VYXc/belarus)
- [Chile](https://apptail.io/app/master-nav-VYXc/chile)
- [China](https://apptail.io/app/master-nav-VYXc/china)
- [Colombia](https://apptail.io/app/master-nav-VYXc/colombia)
- [Denmark](https://apptail.io/app/master-nav-VYXc/denmark)
- [Dominican Republic](https://apptail.io/app/master-nav-VYXc/dominican-republic)
- [Algeria](https://apptail.io/app/master-nav-VYXc/algeria)
- [Ecuador](https://apptail.io/app/master-nav-VYXc/ecuador)
- [Estonia](https://apptail.io/app/master-nav-VYXc/estonia)
- [Hong Kong SAR China](https://apptail.io/app/master-nav-VYXc/hong-kong)
- [Croatia](https://apptail.io/app/master-nav-VYXc/croatia)
- [Indonesia](https://apptail.io/app/master-nav-VYXc/indonesia)
- [Israel](https://apptail.io/app/master-nav-VYXc/israel)
- [Iceland](https://apptail.io/app/master-nav-VYXc/iceland)
- [Japan](https://apptail.io/app/master-nav-VYXc/japan)
- [South Korea](https://apptail.io/app/master-nav-VYXc/south-korea)
- [Kuwait](https://apptail.io/app/master-nav-VYXc/kuwait)
- [Kazakhstan](https://apptail.io/app/master-nav-VYXc/kazakhstan)
- [Lebanon](https://apptail.io/app/master-nav-VYXc/lebanon)
- [Sri Lanka](https://apptail.io/app/master-nav-VYXc/sri-lanka)
- [Lithuania](https://apptail.io/app/master-nav-VYXc/lithuania)
- [Luxembourg](https://apptail.io/app/master-nav-VYXc/luxembourg)
- [Latvia](https://apptail.io/app/master-nav-VYXc/latvia)
- [Nigeria](https://apptail.io/app/master-nav-VYXc/nigeria)
- [Nepal](https://apptail.io/app/master-nav-VYXc/nepal)
- [Peru](https://apptail.io/app/master-nav-VYXc/peru)
- [Pakistan](https://apptail.io/app/master-nav-VYXc/pakistan)
- [Portugal](https://apptail.io/app/master-nav-VYXc/portugal)
- [Romania](https://apptail.io/app/master-nav-VYXc/romania)
- [Saudi Arabia](https://apptail.io/app/master-nav-VYXc/saudi-arabia)
- [Slovenia](https://apptail.io/app/master-nav-VYXc/slovenia)
- [Slovakia](https://apptail.io/app/master-nav-VYXc/slovakia)
- [Tunisia](https://apptail.io/app/master-nav-VYXc/tunisia)

---

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