# IALA Navigation Marks vs MARPOL

The clearest difference is review sentiment: IALA Navigation Marks at 50% against MARPOL's 0%. IALA Navigation Marks also leads on device support (4 vs 2) and iOS requirement (15.6 vs 17.5). MARPOL's advantage is update cadence (every 2 months vs every 23 months). On price, ads, in-app purchases and monetization model there is nothing between them.

IALA Navigation Marks costs $1.99 and MARPOL $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

IALA Navigation Marks ships an update every 23 months, MARPOL every 2 months. Both last shipped on September 10, 2026.

## The numbers

| Metric | IALA Navigation Marks | MARPOL |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 28 MB | 36 MB |
| Requires iOS | **15.6** | 17.5 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Smirnov Yury](https://appshunter.io/developer/420438416) | [OLEKSANDR IZERGIN](https://appshunter.io/developer/1678396126) |

## What reviewers say

### IALA Navigation Marks

[App page](https://appshunter.io/ios/app/iala-navigation-marks/id1224059816)

A quick reference guide for sailors and students to identify maritime navigation marks according to the IALA system. It covers buoy shapes, colors, topmarks, and light rhythms for various mark types, aiding in exam preparation and on-water identification.

**Highlights:** Identify lateral, cardinal, and special marks, Covers buoy shape, color, topmark, and light rhythm, Includes day and night views, Practical study aid for seamanship training, Quick lookup on iPhone and iPad

**In-app purchases:** none


### MARPOL

[App page](https://appshunter.io/ios/app/marpol/id6563146975)

This interactive course covers the MARPOL Convention, including all annexes with detailed visuals. Engage with varied tests to master the material and aim for captain-level knowledge.

**Highlights:** Interactive MARPOL Convention course, All MARPOL Annexes included, Detailed images, Varied tests and tasks, Progress tracking to captain level

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

**In-app purchases:** none


## Frequently asked questions

### Is IALA Navigation Marks free?

IALA Navigation Marks costs $1.99, with no in-app purchases.

### Is MARPOL free?

MARPOL costs $1.99, with no in-app purchases.

### Do IALA Navigation Marks or MARPOL have ads?

Neither IALA Navigation Marks nor MARPOL shows ads.

### Which is updated more often, IALA Navigation Marks or MARPOL?

IALA Navigation Marks ships an update every 23 months, and MARPOL every 2 months. Most recently, IALA Navigation Marks was updated on September 10, 2026 and MARPOL 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.*