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OSTN Update tool

This utility will take OSGB36 National Grid coordinates derived from the old OSTN02/OSGM02 transformation and convert them to be compatible with coordinates derived from the current OSTN15/OSGM15 transformation.
The process is to transform back to ETRS89 using OSTN02/OSGM02 and then transform the ETRS89 coordinates forward to OSGB36 National Grid using OSTN15/OSGM15.

NOTE - this utility does not take into account the relatively small shift in OS Net coordinates from OS Net v2001 to OS Net-v2009. OS Net v2009 coordinates were released at the same time as OSTN15/OSGM15 (August 2016). For more information see this article and "A guide to coordinate systems in Great Britain" (particularly section 6).

OSGB36 derived using OSTN02

Eastings and Northings

* Denotes a required field.

OSGB36 derived using OSTN15

Eastings and Northings

* Denotes a required field.

Batch Transform

* Denotes a required field.

All coordinates should conform to the formats given here.

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© Ordnance Survey 2016