# Tomstrails GPS UTM vs Global Mapper Mobile

The clearest difference is review sentiment: Tomstrails GPS UTM at 84% against Global Mapper Mobile's 29%. Tomstrails GPS UTM also leads on rating (4.8 vs 3.7) and ratings volume (1.6K vs 15). Global Mapper Mobile's advantage is device support (3 vs 1) and iOS requirement (12.2 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Tomstrails GPS UTM sells 1 one-off in-app purchase and Global Mapper Mobile sells 1 in-app purchase, starting at $49.99 per year. Whichever you choose, the download price is not the number that matters.

Tomstrails GPS UTM holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Tomstrails GPS UTM has 1.6K ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 84% of Tomstrails GPS UTM's written reviews are positive against 29% of Global Mapper Mobile's.

Tomstrails GPS UTM ships an update every 6 weeks, Global Mapper Mobile every 4 months. Both last shipped on October 29, 2026.

## The numbers

| Metric | Tomstrails GPS UTM | Global Mapper Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.6K ratings)](https://appshunter.io/ios/app/tomstrails-gps-utm/id1004370364/reviews)** | [3.7 (15 ratings)](https://appshunter.io/ios/app/global-mapper-mobile/id1097875766/reviews) |
| Number of ratings | **1.6K** | 15 |
| Positive reviews | **83.8% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 8 MB | 126 MB |
| Requires iOS | 18.0 | **12.2** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tomstrails.com](https://appshunter.io/developer/425642318) | [Blue Marble Geographics](https://appshunter.io/developer/424089128) |

## What reviewers say

### Tomstrails GPS UTM

[App page](https://appshunter.io/ios/app/tomstrails-gps-utm/id1004370364)

This app provides precise UTM grid references and displays your location on topographic maps. It works offline, supports various regional datums, and offers multiple coordinate formats for easy sharing and use in other applications.

**Highlights:** Fast and accurate UTM grid reference, Locate position on topographic maps, Works without phone signal, Supports regional datums (e.g., ED50), Multiple coordinate formats (1m, 10m, 100m), Share coordinates with other apps, High contrast display for readability

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Feature Pack | Free | one-time |

**What reviewers like**

- 🚀 Simple and free
- 👍 Works well
- 👍 Easy to use
- 👍 Accurate and reliable
- 👍 Great for hiking and emergencies

**What reviewers complain about**

- 🐛 Doesn't do anything
- 🐛 Coordinates not always accurate
- 💰 Requires payment for some features

**Reported bugs**

- Stopped working after iOS update
- UTM grids were off initially, required setting changes

**Requested features**

- Add support for Morocco coordinate system
- Add option to average readings and hold the result
- Add option to reduce coordinate display to 6 digits for emergency use
- Bring back previous features like degrees/minutes display and ability to edit messages


### Global Mapper Mobile

[App page](https://appshunter.io/ios/app/global-mapper-mobile/id1097875766)

This application allows users to view and collect GIS data in the field using their mobile device's GPS. It supports various data layers and offers tools for drawing, tracking, and form-based data collection, with advanced features available through an in-app purchase.

**Highlights:** Vector, raster, and terrain data display, GPS location display and feature creation, Drawing, tracking, and form-based data collection, Image capture and Picture Point creation, Advanced GPS support for GNSS devices, RTK correction via NTRIP client, Offline data access and custom online sources

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Module | $49.99 | per year |


## Frequently asked questions

### Is Tomstrails GPS UTM free?

Tomstrails GPS UTM is free to download, with in-app purchases available.

### Is Global Mapper Mobile free?

Global Mapper Mobile is free to download, with in-app purchases available.

### Which has better reviews, Tomstrails GPS UTM or Global Mapper Mobile?

Tomstrails GPS UTM is rated higher. Tomstrails GPS UTM averages 4.8 out of 5 from 1.6K ratings, while Global Mapper Mobile averages 3.7 from 15 ratings.

### Do Tomstrails GPS UTM or Global Mapper Mobile have ads?

Neither Tomstrails GPS UTM nor Global Mapper Mobile shows ads.

### Which is updated more often, Tomstrails GPS UTM or Global Mapper Mobile?

Tomstrails GPS UTM ships an update every 6 weeks, and Global Mapper Mobile every 4 months. Most recently, Tomstrails GPS UTM was updated on October 29, 2026 and Global Mapper Mobile on October 29, 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.*