EASA NAV(A)intermediate
Match each aeronautical radio navigation aid or system to its primary function: Navigation Aids: 1. NDB / ADF 2. VOR 3. DME 4. VDF Functions: A. Measures slant range distance between aircraft and ground station B. Ground station determines the bearing of an aircraft from its VHF radio transmission C. Airborne receiver indicates bearing to a non-directional ground beacon D. Provides magnetic radial and track guidance to or from the station
Answer
1-C, 2-D, 3-A, 4-B
Explanation
Each system provides different navigation information. ADF points toward an NDB, VOR supplies radial/course guidance, DME measures slant range, and VDF uses a ground station to determine a bearing from the aircraft's VHF transmission. **Key takeaway:** Bearing, course, and distance are different outputs.\n\n**Glossary:** **VDF**: VHF direction finding; **radial**: VOR bearing outward from the station.
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