# GMDSS TRAINER vs USCG Navigation Rules Handbook

The clearest difference is iOS requirement: USCG Navigation Rules Handbook at 15.1 against GMDSS TRAINER's 26.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. GMDSS TRAINER sells 1 one-off in-app purchase and USCG Navigation Rules Handbook sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

GMDSS TRAINER ships an update every 6 weeks, USCG Navigation Rules Handbook monthly. The most recent releases landed on September 6, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | GMDSS TRAINER | USCG Navigation Rules Handbook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 19 MB | 84 MB |
| Requires iOS | 26.1 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Osprey Applications LLC](https://appshunter.io/developer/1619576372) | [SEDX LLC](https://appshunter.io/developer/6776048808) |

## What reviewers say

### GMDSS TRAINER

[App page](https://appshunter.io/ios/app/gmdss-trainer/id6757383433)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $14.99 | one-time |


### USCG Navigation Rules Handbook

[App page](https://appshunter.io/ios/app/uscg-navigation-rules-handbook/id6776329571)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coxswain Pro | $0.99 | one-time |


## Frequently asked questions

### Is GMDSS TRAINER free?

GMDSS TRAINER is free to download, with in-app purchases available.

### Is USCG Navigation Rules Handbook free?

USCG Navigation Rules Handbook is free to download, with in-app purchases available.

### Do GMDSS TRAINER or USCG Navigation Rules Handbook have ads?

Neither GMDSS TRAINER nor USCG Navigation Rules Handbook shows ads.

### Which is updated more often, GMDSS TRAINER or USCG Navigation Rules Handbook?

GMDSS TRAINER ships an update every 6 weeks, and USCG Navigation Rules Handbook monthly. Most recently, GMDSS TRAINER was updated on September 6, 2026 and USCG Navigation Rules Handbook on September 10, 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.*