# GPS Diagnostic vs Doyle Guides

The clearest difference is price: Doyle Guides at Free against GPS Diagnostic's $2.99. GPS Diagnostic's advantage is rating (4.6 vs 4.3) and review sentiment (78% vs 60%). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Doyle Guides is free to download; GPS Diagnostic costs $2.99 up front. GPS Diagnostic sells 1 one-off in-app purchase and Doyle Guides sells 18 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

GPS Diagnostic holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: GPS Diagnostic has 554 ratings behind it against 50, so its average is the more settled of the two. Written reviews point the same way: 78% of GPS Diagnostic's written reviews are positive against 60% of Doyle Guides's.

GPS Diagnostic ships an update every 3 weeks, Doyle Guides every 5 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GPS Diagnostic | Doyle Guides |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.6 (554 ratings)](https://appshunter.io/ios/app/gps-diagnostic-satellite-test/id1020967894/reviews)** | [4.3 (50 ratings)](https://appshunter.io/ios/app/doyle-guides/id6466621237/reviews) |
| Number of ratings | **554** | 50 |
| Positive reviews | **78.0% of reviews** | 60.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#48** | — |
| Size | 34 MB | 52 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Ryall](https://appshunter.io/developer/925576172) | [Chris Doyle Publishing Limited](https://appshunter.io/developer/1707528206) |

## What reviewers say

### GPS Diagnostic

[App page](https://appshunter.io/ios/app/gps-diagnostic-satellite-test/id1020967894)

**Currently charting:** #48 Top Paid · Navigation (US App Store)

This app tests your device's GPS module, providing precise navigation parameters and diagnosing location issues. It supports multiple satellite systems and offers advanced coordinate conversions through an in-app purchase.

**Highlights:** Test GPS module, Fast GPS lock time, Precise navigation parameters, GPS "JumpStart" technology, Full satellite system support, Additional coordinate systems (IAP)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coordinates-Pro | Free | one-time |

**What reviewers like**

- 👍 Helpful diagnostic tool
- 🚀 Provides detailed GPS information
- 🔧 Useful for troubleshooting GPS issues
- 💡 Allows resetting GPS receiver
- 👍 Clean and intuitive interface

**What reviewers complain about**

- 🐛 Compatibility issues with newer iOS versions
- 🔍 Limited satellite data display (only 4 bars)
- 📝 Email support button not working
- 🔍 Lacks detailed information on satellite types

**Reported bugs**

- Crashes on startup for some users
- Fails to detect GPS signal on certain devices

**Requested features**

- Display number of satellites in view and locked
- Expand satellite signal strength graph to show more satellites
- Add support for landscape mode
- Provide more detailed GPS information (e.g., HDOP, VDOP)


### 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 GPS Diagnostic free?

GPS Diagnostic costs $2.99, and also offers in-app purchases.

### Is Doyle Guides free?

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

### Which has better reviews, GPS Diagnostic or Doyle Guides?

GPS Diagnostic is rated higher. GPS Diagnostic averages 4.6 out of 5 from 554 ratings, while Doyle Guides averages 4.3 from 50 ratings.

### Do GPS Diagnostic or Doyle Guides have ads?

Neither GPS Diagnostic nor Doyle Guides shows ads.

### Which is updated more often, GPS Diagnostic or Doyle Guides?

GPS Diagnostic ships an update every 3 weeks, and Doyle Guides every 5 weeks. Most recently, GPS Diagnostic was updated on October 29, 2026 and Doyle Guides on October 27, 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.*