The mile is the unit commonly used in aviation, which is why the DME also measures in this unit. You can read this off on the DME unit as long as you follow the radial. At a ground speed of 120 knots, the aircraft will travel two nautical miles per minute. You also have to manually keep the speed at around 100 knots with the throttle stick. You have to initiate the descent yourself, at the right time, by pressing the UP and DN buttons. Now the autopilot will take you back to the starting airport, but will stubbornly maintain altitude. This only happens when you click NAV on the autopilot. The Cessna now turns to 130 degrees, but does not yet compensate for the probable lateral shift in the course (vertical pointer in the VOR, also visible on the chart display). Then, using the left-hand dial (marked red in Figure 11), turn the heading indicator to the 130 degree radial of the home course determined before takeoff, and click on the HDG (heading) autopilot button. In other words, the aircraft will maintain its current altitude. Click on UP or DN until the number on the right in the autopilot reads 0000 – this stands for a climb rate of zero feet per minute. If you switch it on by selecting AP, then it first holds the course and pitch of the aircraft. In the Cessna model, the autopilot cannot be activated using the FlightGear autopilot menu, but only by clicking on its control buttons in the cockpit. But the KAP-140 autopilot by Bendix can fly along the radial of the active VOR. A Cessna 172P from 1982 only comes with a simple version that cannot be programmed with a route consisting of waypoints. You may want to watch the autopilot first to see how it does this. If the needle is in the middle, simply follow the planned course (white). If it deflects to the right, turn in the same direction (blue). Figure 11: If the vertical VOR needle is to the left of the center, then you fly slightly to the left of the 130 degree course you actually planned (pink).
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