What is involved in flying a localizer back course? A localizer sends out a signal in two directions, the one opposite to the approach to the runway is the back course, and it can also be used for lateral navigation, though the guidance works differently.

When flying inbound on a localizer back course, you need to fly away from the needle, not chase it, this is reverse sensing. Some instrument approach procedures incorporate a back course as guidance, while others, like the infamous LOC/DME-E approach into Aspen, Colorado, use an off field localizer to broadcast a back course as part of a missed approach procedure.

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