GPS Approach Overlay Program is described as

• A. An authorization for pilots to use GPS avionics under IFR for flying designated existing nonprecision instrument approach procedures, with the exception of LOC, LDA, and SDF procedures.
• B. A program to overlay GPS avionics under IFR for all instrument approaches.
• C. A requirement to equip GPS on all aircraft.
• D. A replacement for VOR navigation with GPS overlays.

Answer: (A)

The GPS Approach Overlay Program allows IFR pilots to use GPS avionics to fly designated existing nonprecision instrument approaches by overlaying GPS guidance on those procedures, with exceptions for LOC, LDA, and SDF approaches. This means GPS serves as an added navigation tool on top of the published nonprecision approach, rather than replacing all approaches or requiring GPS on every aircraft. The exceptions—LOC, LDA, and SDF—remain outside the overlay because they already rely on localizer-type signals rather than the GPS overlay concept. So the program expands how pilots can use GPS to navigate NPAs while keeping the original approach procedures and minimums intact.