Victory claims were logged to a map-reference (PQ = Planquadrat), for example "PQ 37432". The Luftwaffe grid map covered all of Europe, western Russia and North Africa and was composed of rectangles measuring 15 minutes of latitude by 30 minutes of longitude, an area of about 360 square miles (930 km2). These sectors were then subdivided into 36 smaller units to give a location area 3x4km in size.[17]