Italian map dated 1940 reprinted in German in 1943. "1 degrees, 22 minutes, East of Rome (Monte Mario) = 12 degrees, 27 minutes, 12 seconds East of Greenwich. Grid lines (purple) follow the Deutsche Heeresgitter (DHG), or German Army Grid system. Easting (Rechts) and Northing (Hoch) coordinates are measured in metres, based on a central merdian of 15 degrees (Meridianstreifen 15 degrees). Latitude/longitude coordinate are based on the prime meridian at Rome (Monte Mario). Contour intervals (Hohenlinien) are 10m.