Navigation aids and instruments are highly beneficial for pilots, allowing them to optimize flight procedures through varying means. Radio magnetic indicators (RMI) and Distance Measuring Equipment (DME) are both commonly found on airliners, each of which aids pilots during flight operations.
The radio magnetic indicator was developed for the means of consolidating various information that was originally spread out across an instrument panel. With the introduction of the RMI, the indications provided by the magnetic compass, ADF, and VOR all could be obtained from a single instrument. With the use of a remote flux gate compass, the RMI has an azimuth card that may rotate to display the magnetic heading of the aircraft. The VOR receiver, meanwhile, adjusts the pointer for a magnetic direction indication that is tuned to a VOR station. Through the constant adjustment provided by the flux gate compass, the pilot is relieved of the management of such indications as would be seen with older instruments. Additionally, pilots are provided with push buttons to easily control the system for more efficiency.
Distance measuring equipment, on the other hand, is a radio navigation aid relied on by pilots for determining the slant range of the aircraft in comparison to a DME ground station. Oftentimes, VOR stations may be situated alongside a military variation known as a TACAN, and such stations are known as VORTAC stations. With the use of distance measuring equipment, the distance between the aircraft and the VORTAC ground station can be determined and displayed on the cockpit flight deck. With these measurements, DME may also calculate aircraft speed and the estimated time of arrival.
For the benefit of pilots, civilian VORs are commonly fitted with DME ground stations and ILS localizers. These stations may be known as VOR/DME, ISL/DME, or LOC/DME. These stations are often beneficial for pilots approaching the runway, assisting them in the landing process. In order to take advantage of such technologies, however, aircraft must have an airborne DME transceiver, display, and antenna. Such stations are quite useful, ensuring that pilots are always aware of their location, and DME operates on the UHF frequency. By measuring the time it takes for a signal to be transmitted and received, distance can be determined in the form of nautical miles.
When using more traditional DME systems or technologies, the distance between the transmitter antenna and the aircraft can be displayed. This measurement is referred to as the slant distance, and it is typically quite accurate. Despite this, the fact that the aircraft is above earth means that the distance between the aircraft and the ground is shorter than that of the aircraft and the station. In some installations, the DME may be advanced enough to utilize altitude and slant distance in order to determine actual distance over ground.
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