What is the purpose of a Radio Magnetic Indicator (RMI)?

The Radio Magnetic Indicator (RMI) serves a crucial role in navigation by receiving and displaying signals from both VHF Omni-Directional Range (VOR) stations and Non-Directional Beacons (NDB). This capability allows pilots to obtain directional information and maintain awareness of their aircraft's position relative to navigational aids. The RMI shows the aircraft's heading and the bearing to the selected navigational aid, helping pilots navigate accurately during flight.

Understanding the design and functionality of the RMI is essential for pilots, as it integrates magnetic heading information and the relative bearing of the navigation aids, allowing for effective navigation even in challenging conditions. The other options do not align with the primary purpose of an RMI. Altitude readings are obtained from altimeters, fuel consumption calculations rely on other flight data, and engine parameters are monitored through different instrumentation.