What system is designed specifically for navigating based on received RF signals?

The VHF Omnidirectional Range (VOR) system is designed to provide aircraft with accurate navigation guidance using radio frequency (RF) signals. It operates by transmitting a continuous signal that allows pilots to determine their position relative to the VOR station. This system works through triangulation, where the aircraft can receive signals from multiple VOR stations to pinpoint its location on a navigation chart.

VOR systems are widely used in aviation for en route navigation and approach procedures, making them a fundamental component in the air traffic management system. They provide information about the aircraft's bearing to the station, enhancing situational awareness and assisting pilots in maintaining their intended flight path. The combination of the RF signals and the aircraft's onboard navigation equipment allows for real-time positioning and directional guidance.

In contrast, other options like Marker Beacon, VHF Navigation (ILS), and Automatic Direction Finder (ADF) serve different functions in navigation and do not specifically provide the omnidirectional capability of the VOR system. While these systems are important for their specific uses in aviation, the VOR stands out for its dedicated purpose of enabling navigation based on RF signals from multiple directions.