iPhone Screenshots


GPS OS provides a fast and accurate way to locate your position on an Ordnance Survey map, both in Great Britain and Ireland.
• No phone signal required - works in the most remote locations.
• OSTN15 transform data for high conversion accuracy (better than 1m).
• 6, 8 and 10 figure grid references.
• A large, clear, high contrast display ensures you can easily read your position in any light conditions.
• Optimises the frequency of position updates depending on battery charge and speed of travel to make sure you can always make calls at the end of the day.
• No adverts.

An In-App Purchase provides additional premium features:
• Magnetic compass bearing.
• Sharing your current location either as a grid reference, or a link to Google Maps.

Includes OSTN15 transform data licensed with permission.
Copyright and database rights Ordnance Survey Limited 2016, ©Crown copyright and database rights Land and Property Services 2016 and/or ©Ordnance Survey Ireland, 2016. All rights reserved.

What’s New

Version 1.80

Added iOS 14 precise location support.
Optimised for new device sizes.

Ratings and Reviews

4.3 out of 5
8 Ratings

8 Ratings

App Privacy

The developer, Tomstrails.com, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like