# MMO Range Finder vs Maritime Master

The clearest difference is review sentiment: MMO Range Finder at 100% against Maritime Master's 0%. MMO Range Finder also leads on rating (5.0 vs 3.0) and in-app purchases (none vs 1). Maritime Master's advantage is price (Free vs $0.99) and update cadence (daily vs every 2 months). On ratings volume, ads and device support there is nothing between them.

Maritime Master is free to download; MMO Range Finder costs $0.99 up front. Maritime Master sells 1 one-off in-app purchase. MMO Range Finder asks for nothing beyond the download.

MMO Range Finder holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 100% of MMO Range Finder's written reviews are positive against 0% of Maritime Master's.

MMO Range Finder ships an update every 2 months, Maritime Master daily. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | MMO Range Finder | Maritime Master |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mmo-range-finder/id1258748649/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/maritime-master-calcdeck/id6760967809/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Paid | **Free** |
| Size | 43 MB | 7 MB |
| Requires iOS | **10.3** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [James Keating](https://appshunter.io/developer/1258748648) | [MARITIME MASTER LIMITED](https://appshunter.io/developer/1107589346) |

## What reviewers say

### MMO Range Finder

[App page](https://appshunter.io/ios/app/mmo-range-finder/id1258748649)

This app helps Marine Mammal Observers calculate distances between animals and acoustic sources during surveys. It uses trigonometric functions and allows users to input target and source bearings and distances for precise mitigation decisions.

**Highlights:** Calculate distance using trigonometric cosine function, Fix compass bearing by pointing device, Convert binocular reticules to distance, Set up to 3 unique observation locations, Save and export sighting data in .csv format, Display vessel position, mitigation zone, and sightings on map, Customise MMO parameters

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

**In-app purchases:** none


### Maritime Master

[App page](https://appshunter.io/ios/app/maritime-master-calcdeck/id6760967809)

This app provides a comprehensive suite of 88 professional maritime calculators for navigation, celestial observation, tides, stability, weather, engineering, and more. It's designed for maritime professionals and enthusiasts, offering offline functionality and citing all formulas with their official sources.

**Highlights:** 88 professional maritime calculators, Offline functionality, Navigation calculations, Celestial observation tools, Stability and cargo calculations, Unit converters

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcDeck Pro | $14.99 | one-time |


## Frequently asked questions

### Is MMO Range Finder free?

MMO Range Finder costs $0.99, with no in-app purchases.

### Is Maritime Master free?

Maritime Master is free to download, with in-app purchases available.

### Which has better reviews, MMO Range Finder or Maritime Master?

MMO Range Finder is rated higher. MMO Range Finder averages 5.0 out of 5 from 1 ratings, while Maritime Master averages 3.0 from 1 ratings.

### Do MMO Range Finder or Maritime Master have ads?

Neither MMO Range Finder nor Maritime Master shows ads.

### Which is updated more often, MMO Range Finder or Maritime Master?

MMO Range Finder ships an update every 2 months, and Maritime Master daily. Most recently, MMO Range Finder was updated on November 2, 2026 and Maritime Master on November 5, 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.*