# PosidoniaMaps vs Doyle Guides

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.

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.

## The numbers

| Metric | PosidoniaMaps | Doyle Guides |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (50 ratings)](https://appshunter.io/ios/app/doyle-guides/id6466621237/reviews)** |
| Number of ratings | — | **50** |
| Positive reviews | **80.0% of reviews** | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 68 MB | 41 MB |
| Requires iOS | **14.5** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Movired 2000 S.L.](https://appshunter.io/developer/1394037133) | [Chris Doyle Publishing Limited](https://appshunter.io/developer/1707528206) |

## What reviewers say

### PosidoniaMaps

[App page](https://appshunter.io/ios/app/posidoniamaps/id1409763408)

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.

**Highlights:** High-resolution underwater maps, Safe mooring guidance, Low visibility navigation, Posidonia meadow mapping, Environmental protection tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Doyle Guides

[App page](https://appshunter.io/ios/app/doyle-guides/id6466621237)

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.

**Highlights:** Comprehensive sailing guides, Nautical charts and navigation, Interactive satellite map, 3000+ points of interest database, User comments and corrections, Island-specific content bundles

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

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trinidad & Tobago - 1 month | $9.99 | per month |
| Martinique Sailing Guide | $19.99 | per month |
| St. Lucia Sailing Guide | $19.99 | per month |
| St. Vincent Sailing Guide | $19.99 | per month |
| Grenada Package - 1 month | $19.99 | per month |
| Trinidad Tobago Sailing Guide | $19.99 | per year |
| Martinique Sailing Guide | $24.99 | per year |
| St. Lucia Sailing Guide | $24.99 | per year |
| St. Vincent Sailing Guide | $24.99 | per year |
| Grenada Package - 12 months | $24.99 | per year |
| Southern Leeward Sailing Guide | $24.99 | per month |
| Northern Leeward Sailing Guide | $24.99 | per month |
| Windward Islands Guide | $29.99 | per month |
| BVI Cruising Guide | $29.99 | per year |
| Windward Islands Guide | $39.99 | per year |
| Virgin Islands Cruising Guide | $39.99 | per year |
| Leeward Islands Sailing Guide | $39.99 | per month |
| Leeward Islands Sailing Guide | $59.99 | per year |


## Frequently asked questions

### Is PosidoniaMaps free?

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

### Is Doyle Guides free?

Doyle Guides is free to download, with in-app purchases available.

### Do PosidoniaMaps or Doyle Guides have ads?

Neither PosidoniaMaps nor Doyle Guides shows ads.

### Which is updated more often, PosidoniaMaps or Doyle Guides?

PosidoniaMaps ships an update every 5 months, and Doyle Guides monthly. Most recently, PosidoniaMaps was updated on June 1, 2026 and Doyle Guides on September 8, 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.*