I have heard about flying an “overlay” approach, and that it is basically flying a VOR or other approach, but using the GPS instead of the VOR or ADF. Can I just use the GPS instead of the VOR?
A. No. Overlay approaches can use GPS instead of the primary designated navigational aid, but the approach must be designated for GPS and be in the current aircraft database. For example, it must say “VOR or GPS RWY 16.” You cannot just use GPS in lieu of VOR, Automatic Direction Finder (ADF) or other navigational source naming the approach. You can, however, use GPS to determine waypoints during the approach.
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