# Navigation Rules vs eSUPPO

The clearest difference is price: eSUPPO at Free against Navigation Rules's $3.99. eSUPPO also leads on review sentiment (100% vs 86%) and update cadence (every 2 months vs every 4 months). Navigation Rules's advantage is rating (4.8 vs 3.5) and ratings volume (389 vs 6). On ads, in-app purchases, monetization model and device support there is nothing between them.

eSUPPO is free to download; Navigation Rules costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Navigation Rules holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: Navigation Rules has 389 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 86% of Navigation Rules's written reviews are positive against 100% of eSUPPO's, so the app with the better star average is not the one people write more warmly about.

Navigation Rules ships an update every 4 months, eSUPPO every 2 months. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Navigation Rules | eSUPPO |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.8 (389 ratings)](https://appshunter.io/ios/app/navigation-rules/id327936562/reviews)** | [3.5 (6 ratings)](https://appshunter.io/ios/app/esuppo/id1102534585/reviews) |
| Number of ratings | **389** | 6 |
| Positive reviews | 85.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 35 MB | 40 MB |
| Requires iOS | 9.3 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [NAVSUP Business Systems Center (BSC)](https://appshunter.io/developer/1102534584) |

## What reviewers say

### Navigation Rules

[App page](https://appshunter.io/ios/app/navigation-rules/id327936562)

Access the complete International Regulations for Preventing Collisions at Sea (COLREGs) and Inland Navigation Rules. This app provides a searchable, annotated version of boating regulations, ideal for quick reference and sharing information.

**Highlights:** COLREGs and Inland Navigation Rules, Annotated table of contents, Search function, Favorites page, Email sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to navigate and user-friendly interface
- 📚 Comprehensive reference material for navigation rules
- 🚀 Quick access to rules on-the-go
- 🎓 Excellent study tool for maritime exams and licenses
- 📖 Well-organized table of contents and structure

**What reviewers complain about**

- 🐛 Poor navigation between rules requires multiple menu presses
- 📄 Walls of text with limited visual content
- 🎨 Inconsistent formatting in some sections (e.g., 8F(iii))
- ❌ Limited additional features beyond basic text content
- 🔄 Clicking definitions forces users to search for original page again

**Reported bugs**

- Formatting inconsistency in rule 8F(iii)
- Navigation issues when jumping between non-sequential rules
- Definition links don't provide easy return to original page
- Typos present in content

**Requested features**

- Quiz or test functionality for self-assessment
- Easier rule-to-rule navigation without menu cycling
- More visual illustrations and diagrams throughout
- Back button functionality when accessing definitions
- Option to separate international and inland rules


### eSUPPO

[App page](https://appshunter.io/ios/app/esuppo/id1102534585)

Access Supply Corps information quickly without multiple logins. Find news, job listings, educational programs, instructions, and contact your detailer. Content can be viewed offline and updates automatically when online.

**Highlights:** Access NAVSUP news, View billet listings, Find educational program info, Access NAVSUP instructions, Contact your detailer, Offline content viewing, Automatic content updates

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Navigation Rules free?

Navigation Rules costs $3.99, with no in-app purchases.

### Is eSUPPO free?

eSUPPO is free to download, with no in-app purchases.

### Which has better reviews, Navigation Rules or eSUPPO?

Navigation Rules is rated higher. Navigation Rules averages 4.8 out of 5 from 389 ratings, while eSUPPO averages 3.5 from 6 ratings.

### Do Navigation Rules or eSUPPO have ads?

Neither Navigation Rules nor eSUPPO shows ads.

### Which is updated more often, Navigation Rules or eSUPPO?

Navigation Rules ships an update every 4 months, and eSUPPO every 2 months. Most recently, Navigation Rules was updated on October 29, 2026 and eSUPPO on October 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*