EPSG_21218: "+proj=tmerc +lat_0=0 +lon_0=54 +k=1 +x_0=18250000 +y_0=0 +ellps=GSK2011 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs" = '+proj=tmerc +lat_0=0 +lon_0=54 +k=1 +x_0=18250000 +y_0=0 +ellps=GSK2011 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs'
GSK-2011 / GSK 3GK zone 18
metre181.41,52.5,50.52,55.5