Navigation Rules vs eSUPPO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Navigation Rules
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.
- COLREGs and Inland Navigation Rules
- Annotated table of contents
- Search function
- Favorites page
- Email sharing
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Navigation Rules contains a complete copy of the International Regulations for Preventing Collisions at Sea, 1972 (COLREGS), including amendments and the Inland Navigation Rules, in effect for all inland waters, including the Great Lakes. App is COLREGs most recent version dated - June 28th, 2019. This app includes an annotated table of contents and a search function to help the reader quickly find the rule and related references. A Favorites page allows quick access to commonly referenced pages. Use the email function to share a page with others. If you are a boater you need to know this information. You might also be interested in our other boating apps: - Boater’s Pocket Reference - Boating Calcs - Seamanship - Ship Captain's Medical Guide
eSUPPO
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.
- Access NAVSUP news
- View billet listings
- Find educational program info
- Access NAVSUP instructions
- Contact your detailer
- Offline content viewing
- Automatic content updates
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Supply Officers (SUPPOs) and others in the Supply Corps community can quickly access Supply Corps information using the new eSUPPO app. You no longer have to log on to multiple websites to find what you need. You can quickly find NAVSUP news, billet listings, educational program information, NAVSUP instructions, and links to related Facebook pages and websites. Using eSUPPO, you can contact your detailer, access forms, and provide feedback via various surveys. eSUPPO can be used offline. Previously downloaded content can be viewed even when you have no Wi-Fi or cell service. When you’re online, content automatically updates.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Navigation Rules | eSUPPO |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.8 (389 ratings) — better | 3.5 (6 ratings) |
| Positive reviews | 85.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 389 — better | 6 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 | 9.0 — better |
| Further details — not scored | ||
| Size | 35 MB | 40 MB |
| Age rating | +4 | 4+ |
| Developer | Calculated Industries | NAVSUP Business Systems Center (BSC) |
Customer experience
Navigation Rules
eSUPPO
Bugs and requests
Navigation Rules
Reported bugs
4 issues- 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
7 requests- 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
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- Interactive flashcards for light signals
- Additional bells and whistles beyond basic manual content
eSUPPO
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Navigation Rules
No in-app purchases
eSUPPO
No in-app purchases
