AIM

8/15/19

1

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7

Navigation Aids

TBL 1

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VOR/DME/TACAN Standard Service Volumes

SSV Class Designator

Altitude and Range Boundaries

T (Terminal) . . . . . . . .

From 1,000 feet above ground level (AGL) up to and including 12,000 feet AGL at radial distances out
to 25 NM.

L (Low Altitude) . . . .

From 1,000 feet AGL up to and including 18,000 feet AGL at radial distances out to 40 NM.

H (High Altitude) . . . .

From 1,000 feet AGL up to and including 14,500 feet AGL at radial distances out to 40 NM. From
14,500 AGL up to and including 60,000 feet at radial distances out to 100 NM. From 18,000 feet AGL
up to and including 45,000 feet AGL at radial distances out to 130 NM.

TBL 1

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NDB Service Volumes

Class

Distance (Radius)

Compass Locator

15 NM

MH

25 NM

H

50 NM*

HH

75 NM

*Service ranges of individual facilities may be less than 50 nautical miles (NM). Restrictions to service
volumes are first published as a Notice to Airmen and then with the alphabetical listing of the NAVAID in
the 

Chart Supplement U.S.

FIG 1

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Standard Terminal Service Volume

(See FIG 1

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4 for altitudes below 1,000 feet).

25 NM

12,000 ft.

1,000 ft.