What is a "VOR" primarily used for in instrument flight?

A VOR, or VHF Omnidirectional Range, is primarily used for navigation in instrument flight because it provides pilots with radial information relative to the ground station. This means that the VOR transmits signals that create a 360-degree radial heading, allowing pilots to determine their position and intended course. By tuning the aircraft's navigation radio to a specific VOR frequency, pilots can receive bearings and navigate along designated airways efficiently.

The system is critical for ensuring precise navigation in instrument flight, especially when flying in poor visibility conditions. Pilots use VORs to fly routes and approach procedures by following the radial line from the VOR station, which helps maintain situational awareness and enhances safety during flight.

The other options, while related to various flight instruments and operations, do not accurately describe the primary function of a VOR. For instance, altitude and vertical speed measurement are primarily managed by altimeters and vertical speed indicators, and communication with air traffic control typically relies on radio communication channels, rather than navigation aids like VORs. Fuel consumption calculations are also unrelated to the primary purpose of a VOR.