What does VOR/DME RNAV utilize to determine aircraft position?

VOR/DME RNAV (VOR with Distance Measuring Equipment) utilizes VOR and DME signals to accurately determine an aircraft's position. The VOR provides radio signals that help pilots determine their direction relative to the VOR station, while the DME measures the slant range distance from the aircraft to the DME-equipped VOR station. By using the combination of these signals, the aircraft’s navigation system can calculate its current position in relation to the VOR station. This method allows for precise navigation and enhances the ability to perform efficient route planning in various flight operations.

The other options do not apply because the Global Positioning System offers a different technology for position determination entirely, ground radar systems serve a distinctly separate purpose in air traffic control, and visual flight rules pertain to operational procedures rather than position determination technology.