OSTN15 OSGM15 transformation software

Transform coordinates from one format to another with our software

Grid InQuestII software

Our Grid InQuestII software transforms between the ETRS89 (WGS84) and OSGB36 National Grid coordinate systems using the transformation models (OSTN15/OSGM15).

You can use Grid InQuestII to transform a single coordinate or a batch of coordinates. It incorporates a wizard so you can even define your own input file format.

Grid InQuestII is available to install directly onto a PC, which means it doesn't have to be used online.

If you want to incorporate OSTN15/OSGM15 into other software and applications, see our OSTN15 and OSGM15 developer page.

The software is compatible with Microsoft Windows (XP, Vista, 7 and 10) 32 bit and 64 bit, OSX and Linux 32 bit and 64 bit.

It is licensed as per the BSD Licence.

OSTN15/OSGM15 replaced previous models OSTN02/OSGM02 in August 2016. Read about the change (PDF).You can also download the old Grid InQuest software (ZIP).