The VHF navigation signals processed include which pair?

• A. VOR and ILS
• B. ILS and GPS
• C. VOR and GPS
• D. VOR and ILS

Answer: (D)

VHF navigation relies on two main aids: VOR and ILS. VOR provides azimuth information by transmitting signals in the VHF band that your receiver uses to determine the aircraft’s bearing relative to the station. ILS has a localizer component that operates in VHF and gives precise lateral guidance to the runway, while its glide slope is in UHF. Since both VOR and the localizer portion of ILS use VHF frequencies, they are the VHF navigation signals your systems process. GPS operates in a different portion of the spectrum (L-band) and isn’t part of VHF navigation, so the pair that fits the VHF category is VOR and ILS.