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 (<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 & Property Services 2016 and/or © Ordnance Survey Ireland, 2016. All rights reserved.

What's New

Version 1.65

Optimised for additional phone sizes.

Ratings and Reviews

4.7 out of 5

1.1K Ratings

1.1K Ratings

Clear & simple display of OS grid ref

Andy T8

Does what it says on the tin without mobile coverage or adverts! Recent update adds option of greater precision 10 digit references or the more common 6 or 8. Optional purchase to enable sharing of location. All it needs is facility to display lat / long as well to round out this very useful app.

Very useful when working with others who are using paper OS maps. I also prefer os grid refs when on land in uk to the lat/long equiv with deg min sec - easier to remember and direct correlation to metres on the ground.

Simple, useful


A simple little app, but very effective and accurate with or without a phone signal. I have used it a lot, and feared it was lost following upgrade to iOS 11. Glad it has been updated, anticipation of any future incompatible OS upgrade would be appreciated.

Excellent use of GPS data


A classic implementation of keep it simple approach. Instead of trying to do every thing it does one thing well. In an emergency having this app could save your life or your partner. Keep it with you when exploring the great outdoors and enjoy...A great backup for map and compass exploration.


John Spinks
17.2 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad 2 Wi-Fi + 3G, iPad Wi‑Fi + Cellular (3rd generation), iPad Wi-Fi + Cellular (4th generation), iPad mini Wi-Fi + Cellular, iPad Air Wi-Fi + Cellular, iPad mini 2 Wi-Fi + Cellular, iPad Air 2 Wi-Fi + Cellular, iPad mini 3 Wi-Fi + Cellular, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro Wi‑Fi + Cellular, and iPad Wi-Fi + Cellular (6th generation).
Age Rating
Rated 4+
© Tomstrails
In-App Purchases
  1. Feature Pack - Compass & sharing features. £0.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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