# GPS vs Nautical Rules

The clearest difference is price: Nautical Rules at Free against GPS's $0.99. Nautical Rules also leads on update cadence (every 3 weeks vs every 14 months). GPS's advantage is chart position (#173 vs unranked) and iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Nautical Rules is free to download; GPS costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GPS ships an update every 14 months, Nautical Rules every 3 weeks. The most recent releases landed on September 18, 2026 and July 17, 2026 respectively.

## The numbers

| Metric | GPS | Nautical Rules |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/nautical-rules/id6756220989/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 3 weeks** |
| Monetization | — | Free |
| Best chart rank | **#173** | — |
| Size | 1 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [domesticusdevelop](https://appshunter.io/developer/373834594) | [Joseph Kim](https://appshunter.io/developer/1855404156) |

## What reviewers say

### GPS

[App page](https://appshunter.io/ios/app/gps-barometer-dd/id1205154917)

**Currently charting:** #173 Top Paid · Navigation (US App Store)

**Features:** macOS Compatibility

**In-app purchases:** none


### Nautical Rules

[App page](https://appshunter.io/ios/app/nautical-rules/id6756220989)

Master USCG Navigation Rules with a comprehensive question bank and smart study features. Track your progress, practice for exams, and study offline to navigate with confidence.

**Highlights:** 1,200+ practice questions, Inland and International waters coverage, Detailed explanations, Customizable tests, Offline study capability, Progress tracking dashboard, Accuracy by rule statistics

**In-app purchases:** none


## Frequently asked questions

### Is GPS free?

GPS costs $0.99, with no in-app purchases.

### Is Nautical Rules free?

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

### Do GPS or Nautical Rules have ads?

Neither GPS nor Nautical Rules shows ads.

### Which is updated more often, GPS or Nautical Rules?

GPS ships an update every 14 months, and Nautical Rules every 3 weeks. Most recently, GPS was updated on September 18, 2026 and Nautical Rules on July 17, 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.*