ETRS89 / Guernsey Grid 3108 ETRS89 4258 ellipsoidal 6402 Geodetic latitude 9901 Lat north Geodetic longitude 9902 Lon east European_Terrestrial_Reference_System_1989 6258 Greenwich 8901 0 GRS 1980 7019 6378137 298.257222101 49.5 -2.416666666666667 0.999997 47000 50000 Cartesian 4400 Easting 9906 E east Northing 9907 N north