It gives the radial we are crossing and the distance to the station. We need tune in to just one VOR-DME to pinpoint our position.(in FlightGear the identity can be found in the property tree at /instrumentation/nav/nav-id) That identity gives a good clue where we are on the map but we have to pinpoint our position before we can navigate any further. Lucky most radio beacons tell their identity, in Morse code or in other ways. Going further on the way it is possible to get lost so it is important to figure out where we are if we get lost. We always start from an airport, we know where it is on the map. Position finding with NDB, VOR and VOR-DME For long tracks without radio beacons nearby (and no GPS) it is the only way to navigate. Even with the navigational tools that are available today we rely on this method without knowing it. If there is a good compass and the ground speed is known it is even possible to do some navigation with this method. If you know where you are and how fast you move you can predict where you will be after some time. Always check if the VOR provides a radial before using it for automated flight.ĭead reckoning ( DR) is a technique we use every day in many situations.
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