VOR DME approach: An instrument approach procedure that specifies a VOR radial as the course to follow to the runway, and where DME is used to give information about the distance to the runway.Īnyway, that's a lot of information to absorb. An LDA is simply a localizer that is not aligned ("offset" to use the official parlance) with with the approach runway. A localizer is basically a VOR station with only one radial, which is aligned with a runway as part of an instrument approach procedure. In these cases, the localizer antenna array may be offset (i.e. It is used in places where, due to terrain and other factors, the localizer antenna array is not aligned with the runway it serves. To talk about an LDA, we have to establish what a localizer is. A localizer type directional aid (LDA) or Instrument Guidance System (IGS) is a type of localizer-based instrument approach to an airport. LDA stands for Localizer-type Directional Aid. DME is usually co-located with a VOR or Localizer station, but there are a few that are co-located with other types of radio aids or stand alone. A DME readout in the airplane gives you the distance to or from the DME antenna in "slant" range, or straightline (between the airplane and the ground-based antenna) distance. Any of the given courses are called "radials," and there there are 360 of them, just like there are 360 degrees in a circle.ĭME stands for Distance Measuring Equipment (I'd put the letters in bold also, but it's too much work) DME is just what it says it measures distance. The VOR reciever in the airplane allows you to select the course which you'd like to fly to or from the VOR station, and then gives you information about where you are in relation to that course. VOR stands for Very high frequency Omnidirectional Range.
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