The automatic flight control system (AFCS) in an aircraft is coupled to the guidance outputs from an inertial navigation system (INS). The aircraft is flying between inserted waypoints No. 3 (55° 00N 020° 00W) and No.4 (55° 00N 030° 00W). With DSRTK/STS selected on the CDU, to the nearest whole degree, the initial track read- out from waypoint No. 3 will be: