PosidoniaMaps vs Doyle Guides
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PosidoniaMaps
This app provides high-resolution underwater maps to help boaters navigate and find safe mooring spots, even in poor visibility. It aims to protect vital Posidonia oceanic meadows by making them visible and encouraging responsible anchoring.
- High-resolution underwater maps
- Safe mooring guidance
- Low visibility navigation
- Posidonia meadow mapping
- Environmental protection tool
Read full descriptionHide full description
Initiated in Formentera, a project to map Posidonia oceanic meadows and make them visible with an app and google earth. Every square meter of mapped and visible Posidonia is a protected meadow. In the past 50 years, it is estimated 34% of Posidonia meadows have been lost in the Western Mediterranean (Telesca et al., 2015). This loss is due to damage caused by trawlers, boat moorings, coastal development, eutrophication, and pollution. Damage caused by boats’ anchors has been recorded at various coastal marine habitats worldwide; for example, coral reefs (Dinsdale & Harriott, 2004). Anchoring also has negative consequences on Posidonia (Milazzo M., 2004; Francour P., 1999), and has caused the disappearance of large prairies in some areas of the Balearic Islands (San Felix, in press, 1994). This App provides direct access to high-resolution underwater maps to ensure proper mooring even in low visibility conditions.
Doyle Guides
Access comprehensive sailing guides for the southern Caribbean, featuring nautical charts, regulations, services, and points of interest. The app offers an interactive map with user-generated comments and corrections, all free to use. In-app purchases provide access to detailed guide book content.
- Comprehensive sailing guides
- Nautical charts and navigation
- Interactive satellite map
- 3000+ points of interest database
- User comments and corrections
- Island-specific content bundles
Read full descriptionHide full description
Doyle Guides produces the southern Caribbean's most comprehensive and up-to-date sailing guides, complete with nautical charts and navigational information, details on regulations, customs and immigration, general and technical yacht services, marinas, restaurants, provisioning, shore-based attractions, and more. The Doyle Guides mobile app allows users to search our comprehensive 3000+ point of interest database with results shown based on distance from the user and displayed on an interactive satellite map where users can leave public comments as well as suggest corrections and new points of interest, all free of charge. Subscriptions to guide book content is available on both long and short term basis, as well as bundled by island.
Screenshots
Verdict
The clearest difference is in-app purchases: PosidoniaMaps at none against Doyle Guides's 18. PosidoniaMaps also leads on review sentiment (80% vs 60%) and iOS requirement (14.5 vs 16.6). Doyle Guides's advantage is update cadence (monthly vs every 5 months). On price, ads 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
Both are free to download. Doyle Guides sells 18 in-app purchases, starting at $9.99 per month. PosidoniaMaps asks for nothing beyond the download.
PosidoniaMaps ships an update every 5 months, Doyle Guides monthly. The most recent releases landed on June 1, 2026 and September 8, 2026 respectively.
| Parameter | PosidoniaMaps | Doyle Guides |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (50 ratings) — better |
| Positive reviews | 80.0% of reviews — better | 60.0% of reviews |
| Number of ratings | — | 50 — better |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.5 — better | 16.6 |
| Further details — not scored | ||
| Size | 68 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Movired 2000 S.L. | Chris Doyle Publishing Limited |
Customer experience
PosidoniaMaps
Doyle Guides
In-app purchases
PosidoniaMaps
No in-app purchases
Doyle Guides
- Trinidad & Tobago - 1 month3 Days trial$9.991 Month
- Martinique Sailing Guide3 Days trial$19.991 Month
- St. Lucia Sailing Guide3 Days trial$19.991 Month
Show 15 moreShow fewer
- St. Vincent Sailing Guide3 Days trial$19.991 Month
- Grenada Package - 1 month3 Days trial$19.991 Month
- Trinidad Tobago Sailing Guide7 Days trial$19.991 Year
- Martinique Sailing Guide7 Days trial$24.991 Year
- St. Lucia Sailing Guide7 Days trial$24.991 Year
- St. Vincent Sailing Guide7 Days trial$24.991 Year
- Grenada Package - 12 months7 Days trial$24.991 Year
- Southern Leeward Sailing Guide3 Days trial$24.991 Month
- Northern Leeward Sailing Guide3 Days trial$24.991 Month
- Windward Islands Guide3 Days trial$29.991 Month
- BVI Cruising Guide3 Days trial$29.991 Year
- Windward Islands Guide7 Days trial$39.991 Year
- Virgin Islands Cruising Guide3 Days trial$39.991 Year
- Leeward Islands Sailing Guide3 Days trial$39.991 Month
- Leeward Islands Sailing Guide7 Days trial$59.991 Year








