VOR (VHF Omnidirectional Range)

Terminal Class VOR

TACAN (Tactical Air Navigation) or DME (DistanceMeasuring Equipment)

Terminal class TACAN


NDB (Nondirectional Radio

Compass Locator (Charted only when providing an enroute function or TWEB); or a SABH
class radio beacon.

Magnetic north ticks on navigational facilities fit compass roses on IFR Enroute Chart Plotters, making it possible to measure the magnetic bearing of any track.

LOC, LDA, or SDF Front Course

LOC Back Course

MLS Course

KRM Course


Elliptical Pattern

Bone Pattern

Fan Marker and NDB



Armed Forces Radio Station


Navaid identification is given in shadow box when navaid is airway or route component, with frequency, identifier, and Morse Code. DME capability is indicated by a small "D" preceding the VOR frequency at frequency paired navaids. VOR and VORTAC navaid operational ranges are identified (when known) within the navaid box except on USA and Canada charts. (T) represents Terminal; (L) represents Low Altitude; and (H) represents High Altitude.

Heavier shadow boxes are gradually replacing existing shadow boxes. There is no difference in meaning.

On HIGH/LOW altitude enroute charts, geographical coordinates (latitude and longitude) are shown for navaids forming high or all altitude airways and routes. On Area charts, geographical coordinates are shown when navaid is airway or route component. Some L/MF navaids are combined in the shadow box even though they are not part of the airway/route structure, except on US and CA charts. They are used for course guidance over lengthy route segments when airway/track is designated into a VOR.

When VOR and TAC/DME antennas are not co-located, a notation "DME not Co-located " is shown below the navaid box.

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Off-airway navaids are unboxed on Low and High/Low charts. TACAN/DME channel is shown when VOR navaid has frequency paired DME capability. When an L/MF navaid performs an enroute function, the Morse Code of its identification letters are shown. (Off-airway VORs are boxed except on US and CA charts.)

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When TACAN or DME are not frequency paired with the VOR, the TACAN is identified separately. The "Ghost" VOR frequency, shown in parentheses, enables civilian tuning of DME facility.

The navaid frequency and identification are located below the location name of the airport when the navaid name, location name, and airport name are the same.

LOC, SDF, LDA, MLS, and KRM navaids are identified by a round cornered box when they perform an enroute function. Frequency identification and Morse Code are provided. DME is included when navaid and DME are frequency paired.

Fan marker name and code.

DIal-up Remote Communications Outlet (DRCO)(Canada). Connects pilot with an ATS unit via a commercial telephone line. See Canada Air Traffic Control pages for details.