What is the satellite-based system that provides navigation signals for precise positioning?

The satellite-based system that provides navigation signals for precise positioning is GPS, which stands for Global Positioning System. This system uses a network of satellites that orbit the Earth, which transmit signals that GPS receivers on the ground can pick up. By calculating the time it takes for these signals to arrive from multiple satellites, the receiver can determine its exact location in three-dimensional space, as well as its speed and direction of travel.

GPS is widely used in aviation for navigation and situational awareness, allowing pilots to navigate accurately over long distances without relying solely on ground-based navigation aids. This technology has revolutionized not only aviation but also various modes of transportation, enhancing safety and efficiency.

The other options refer to different navigational aids: ELT (Emergency Locator Transmitter) is used for distress signaling, VOR (VHF Omnidirectional Range) is a ground-based radio navigation system, and ILS (Instrument Landing System) assists pilots with their approach and landing by providing guidance information. Each of these systems serves specific purposes, but none provide the precise positioning capabilities of GPS.