Combat Clock 4aCombat Clock 4a is a contemporary replica of a 1943 U.S. Army Air Forces 24-hour bulkhead type clock from an air station's radio room. A 2nd hour hand (green) indicates Zulu time (GMT).The two red sectors indicate radio silence periods.Location data is leveraged to display current GPS coordinates, heading and compass bearing that indicates the direction the top of the device (portrait mode) is pointing to (12 is North, 6 South, 3 East and 9 is West). The application is active only when it is in the foreground. No location or personal data is saved or sent from the device. There are no in-application advertisements, or purchases.