Master vs e
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Master
Learn maritime navigation rules with an interactive system designed for effective retention. This app breaks down complex regulations into manageable sections with visual aids and mnemonics. It revisits incorrect answers and provides instant graphical feedback, making the learning process intuitive and efficient.
- Interactive learning system
- Step-by-step rule guidance
- Mnemonics and memory aids
- Interactive visuals
- Graphical feedback on answers
- Practice section with progress tracking
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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.
e
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e-TRB functions as an Electronic Record Book designed for educational institutions to oversee students participating in onboard training. The system comprises two applications: a mobile app and a web app. The mobile app caters to cadets and officers, offering the flexibility to function offline or online. Regarding the process of updating daily records, both applications operate harmoniously. They can function independently or complement each other seamlessly. The sole prerequisite for synchronization is establishing an internet connection for the mobile app.
Screenshots
Verdict
The clearest difference is price: e at Free against Master's $1.99. e also leads on iOS requirement (12.3 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
e is free to download; Master costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Master ships an update fortnightly, e every 10 days. The most recent releases landed on October 1, 2026 and September 27, 2026 respectively.
| Parameter | Master | e |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.7 (94 ratings) — better | — |
| Positive reviews | 96.9% of reviews | — |
| Number of ratings | 94 — better | — |
| Update frequency | Fortnightly | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 12.3 — better |
| Further details — not scored | ||
| Size | 117 MB | 58 MB |
| Age rating | 4+ | 17+ |
| Developer | Peterjohn Chisholm | ELOSOFT INC |
In-app purchases
Master
No in-app purchases
e
No in-app purchases









