Which set contains only conventional ground-based radio navigation aids identified in the material?

### Why this is right The material identifies VOR, DME, NDB, and ILS as common ground-based radio navigation aids. Using them requires suitable certified onboard equipment. ### The concept Conventional radio navigation uses radio signals associated with ground stations and procedures. Charts show relevant routes and may provide headings, distances, and minimum altitudes for segments. This differs from satellite navigation, which uses signals from orbiting satellites, and from pilotage, which uses visible ground features. ### The other options - **B. Global Positioning System (GPS), gyroscope, accelerometer, and route log**: this combines satellite navigation, inertial sensors, and planning equipment, not a set of conventional ground-based radio aids. - **C. Visual landmark, shoreline, highway, and town**: these are visual references used in pilotage. - **D. Aeronautical Information Regulation and Control (AIRAC), plotter, compass, and airport**: this mixes a navigation database cycle, planning tools, and a location rather than naming radio aids. ### Terms - **Very High Frequency Omnidirectional Range (VOR)**: a ground radio aid used to determine direction relative to a station. - **Distance Measuring Equipment (DME)**: a radio aid that provides distance information to a ground station. - **Non-Directional Beacon (NDB)**: a ground beacon received by aircraft equipment to provide bearing information. - **Instrument Landing System (ILS)**: a ground-based system that provides guidance for an instrument approach. ### Remember Conventional radio navigation depends on ground aids, onboard equipment, and signal coverage.