Home / Transformation OSGB36 / National Grid to WGS 84 (1) EPSG:27700 → EPSG:4326 Deprecated Coordinate Reference Systems Source CRS EPSG:27700 OSGB36 / British National Grid Projected Target CRS EPSG:4326 WGS 84 Geographic 2D Remarks Assumes ETRF89 is coincident with WGS 84. Accuracy about 0.5m.