In a previous post (at this link) I have explained the German ‘Stosslinie’ system by which units were given locations on a standard map. The picture below shows such a line on an Italian map used by the German intelligence officer in Panzergruppe Africa’s command staff. The line starts with the value of 65 north of B. el Harmarin/south-east of Mechili, and ends with the value of 105 at Bir el Gobi.