---
title: "GPS OS Grid Reference — App Overview"
url: https://marlvel.ai/intel-report/navigation/gps-os-grid-reference
category: Navigation
developer: Tomstrails.com
platforms: ios
rating: 4.3 (14 ratings)
pricing: free
report_level: overview
generated: 2026-04-27
last_verified: "2026-04-27T16:29:46.304Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a specialized, ad-free utility focused on high-precision offline navigation for Ordnance Survey map users.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Navigation |
| Rating | 4.3 ★ (14) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 3.0.2 |
| Developer | Tomstrails.com |

<!-- SECTION: Summary -->
## What is GPS OS Grid Reference?

GPS OS Grid Reference is a navigation tool designed to provide precise Ordnance Survey map coordinates for Great Britain and Ireland. It functions offline and utilizes OSTN15 transform data to ensure high-accuracy positioning while optimizing battery consumption for extended field use.

<!-- SECTION: Key Features -->
## Key Features

- **Offline Positioning**: Provides location tracking without the need for a phone signal, suitable for remote environments.
- **OSTN15 Transform Data**: Delivers high-accuracy coordinate conversion with precision better than 1 meter.
- **Adaptive Battery Management**: Adjusts update frequency based on travel speed and battery levels to preserve power.
- **Waypoint Management**: Allows users to create, share, and navigate to waypoints via Apple Maps or manual coordinate entry.

<!-- SECTION: Target Audience -->
## Who is it for?

Outdoor enthusiasts and hikers requiring reliable, offline location tracking in remote areas.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/gps-os-grid-reference/id993436655?uo=4)
- [Full Intelligence Report](https://marlvel.ai/intel-report/navigation/gps-os-grid-reference)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/navigation/gps-os-grid-reference).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*