GB Grid Reference to Lat/Long converter

Error: If alpha used, there must be an even number of digits
Search argument is: ?pagename=%E5%9C%A3%E5%A8%81%E5%B0%94%E5%BC%97%E9%87%8C%E5%BE%B7%E6%95%99%E5%A0%82&params=SD+563,103_region:GB_scale:25000
How to use this resource | Usage log | Go back
What is a grid reference anyway?
Code derived from convert.c found among Tony Fisher's files.
See also this interactive guide to the National Grid.
Copyright © 2005 - 2011 Roger W Haworth and several others
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public Licence as published by the Free Software Foundation; either version 2 of the License, or any later version.
This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public Licence for more details.

Source code

 compared with geohack.php and includes as at 2011 Feb 23
cooerr.php  this file, included by coor_g.php on errorsnew
coor_g.php  OSGB36 → WGS84 converter
Roger Haworth's own work. All the following are by others  
geohack.php  map sources displaycan use geotemplate.txt for testing
geo_param.php  included by geohack.phpsame
helm_gb.php  required by transversemercator.phpnew
llfuncsm.php  required by coor_g.phpnew
mapsources.php  included by geohack.phpuses WGS2OSGB() and generates $osgb36_6fig
transversemercator.php  required by mapsources.phpadded WGS2OSGB