I'm doing research on military operations and movements of German troops in Italy (Cecina-Castellina Marittima-Livorno zone) during the allied offensive on July 1944. (Rome-Arno Campaign) The 16th SS Panzergrenadier Division Reichsführer SS and the 19th Luftwaffe Field Division were the divisions in this area. I found some geographic references in some German battle reports (Tagesmeldung) but do not understand their origin. For example: "1 km S 9226", 3km NW 7431 or "im Raum S 5025 etc .. What is the meaning of the four digits? How can I locate these points? Thank you for your help.