When an aircraft is equipped with a GPS system that outputs roll steering commands, a pilot can rely on the autopilot to control the steering of the aircraft for enroute or approach flight. Since the GPS determines the exact location and ultimate destination, the GPSS feature will fly the necessary flight path as defined by the flight plan in the GPS. At different legs in the flight plan, the GPS calculates the exact turn point based on the speed of the aircraft. The GPS then sends steering commands to the GPSS and the autopilot will fly a precisely curved transition path between the legs. GPSS greatly reduces workload by also allowing the pilot to not have to set the course arrow or heading bug at leg changes.