Converting between two datums Helmert transformation: WGS84 to OSGB36 (OSTN2): cx: −446.448 cy: 125.157 cz: −542.06 s: 20.4894 rx: −0.1502 ry: −0.247 rz: −0.8421 Accuracy of about 7m for a OSGB36/WGS84 transformation See also: