Easily convert between British National Grid References (OS Grid Refs) and Latitude, Longitude coordinates (both OSGB36 and WGS84 are supplied).

Then, easily view the converted coordinate in the Maps app, or send it to GPS Log (our app for recording your travels). Or copy to the clipboard using the standard iPhone functions.

Fuzzy parsing logic allows you to input coordinates in a variety of ways, like "TQ 30267 76930", and "TQ302769".

If you have any problems using this software, please contact us by email: so we can work with you to solve the problem. Issues left as reviews are difficult to address.

What's New

Version 2.4

64-bit support.

Ratings and Reviews

3.8 out of 5
41 Ratings
41 Ratings
Beas1ey ,

Works just fine

Like that you can find coordinates by dropping pin in map not just by current location.

Could be more accurate though as trying to tag fields that are less than 100m away from each other produce the same coordinates!

Is there a way to increase accuracy by another decimal place?...

Tfler ,


Top app. So helpful for giving you the decimal GPS coordinates, which you can give to friends to locate your position if you're trying to meet up (they just need to plug it into google maps direct). The existing iphone compass doesn't have decimal coordinates for GPS, so this app is essential.

Mr. McKevvy ,

Brilliant app!

This app is brilliant. I work in the fuel delivery industry and I need to convert decimal co-ordinates to OS.
This app not only does it offline (I'm not always in an area where I can get a signal), but it also plots it on Google/Apple maps.

Thank you SO much. I'm a very happy tanker driver now :)


Geospike Pty Ltd
6.1 MB
Requires iOS 11 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 2010-2013 William Denniss
In-App Purchases
  1. GB Grid Converter Premium £1.99


  • Family Sharing

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

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