PVOR - What does PVOR stand for? The Free Dictionary
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This PVOR functionality is useful in situations where we want to select a specific course to or from a waypoint, rather than simply going directly to it.
Another handy use of PVOR is visual approach guidance to any runway, regardless of whether there is a published approach.
A last example of an occasion to use PVOR functionality is an alternative to the vectors-to-final mode (VTF) on an approach that features step-downs outside the FAF.