What Is Dme Aviation?

How does the DME work?

Distance Measuring Equipment ( DME ) is defined as a navigation beacon, usually coupled with a VOR beacon, to enable aircraft to measure their position relative to that beacon. Aircraft send out a signal which is sent back after a fixed delay by the DME ground equipment.

What is the DME in aviation?

The Distance Measuring Equipment ( DME ) is a radio navigation aid used by pilots to determine the aircraft’s slant range from the DME ground station location. The DME avionics in aircraft send a pulse signal to the ground based DME, which responds with an answer pulse signal.

What is DME and how it works?

Distance measuring equipment ( DME ) is a system requiring both aircraft-installed and ground-based equipment, with the latter normally co-located with a VHF omnidirectional radio range (VOR) or, sometimes, an instrument landing system (ILS). It provides the pilot with the slant-range distance to the DME transmitter.

What is the difference between VOR and DME?

The VOR allows the receiver to measure its bearing to or from the beacon, while the DME provides the slant distance between the receiver and the station. Together, the two measurements allow the receiver to compute a position fix.

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How do I find DME?

The TACAN or DME is identified by a coded tone modulated at 1350 Hz. The DME or TACAN coded identification is transmitted one time for each three or four times that the VOR or localizer coded identification is transmitted.

Is DME required for ILS?

No, a DME is not required for all ILS approaches; however, there are some ILS / DME approaches that require it. Normally it’s because they have an arc or the distance is needed to locate a fix on the approach.

Is DME required for IFR?

The aircraft must be equipped with a DME receiver if DME is required to fly the approach procedure(s) at the alternate airport. Aircraft utilizing IFR GPS in lieu of DME operating at or above FL240 are not required to be equipped with DME.

What is a DME fix?

The geographical position determined by reference to a navigational aid (NAVAID), which provides distance and azimuth information, and defined by a specified distance in nautical miles and magnetic radial degrees from the NAVAID.

How accurate is DME?

Accuracy. The accuracy of DME ground stations is 185 m (±0.1 nmi). It’s important to understand that DME provides the physical distance between the aircraft antenna and the DME transponder antenna.

Is DME required for VOR DME approach?

VOR capability (or GPS equivalent) is assumed, so it’s never stated as a requirement. An ILS never requires DME for identifying the FAF or DA because the FAF is glideslope intercept and DA is by altitude. The answer is that DME is only required for the localizer approach.

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What is the airborne DME called?

The range of service is most often up to 300 land miles (480 km). System accuracy is usually 0.1 nautical miles (185 m) but precision equipment, intended for use during landing, has accuracy up to 100 ft (30 m). The airborne equipment, called an interrogator, transmits pulses of 1 kW peak power on 1 of 126 frequencies.

How do you tell if a VOR is high or low?

As far as high / low VOR, one way to tell is to look at the High / Low enroute IFR charts. You can see two VOR stations on here labeled Minot Intl and Devils Lake Rgnl with a victor airway between them (V430).


In its simplest form, VOR / DME RNAV allows the pilot to electronically move VORTACs around to more convenient locations. Once electronically relocated, they are referred to as waypoints. These waypoints are described as a combination of a selected radial and distance within the service volume of the VORTAC to be used.

Is VOR same as ILS?

VOR stands for VHF Omnidirectional Range and is a way to help aircraft navigate by using fixed ground based beacons. ILS stands for Instrument Landing System and is a radio system that enables aircraft to land on a runway safely even without visual contact.

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