RADIO AIDS TO NAVIGATION (NAVAIDs)
All IFR radio NAVAIDs that have been flight checked
and are operational are shown on IFR Enroute charts.
VHF/UHF NAVAIDs (VORs, TACANs, and UHF NDBs)
are shown in black, and LF/MF NAVAIDs (Compass
Locators and Aeronautical or Marine NDBs) are shown
On enroute charts, information about NAVAIDs
is boxed as illustrated below. To avoid duplication of
data, when two or more NAVAIDs in a general area
have the same name, the name is usually printed only
once inside an identification box with the frequencies,
TACAN channel numbers, identification letters, or
Morse Code identifications of the different NAVAIDs all
shown in appropriate colors.
NAVAIDS that have a status of shutdown will
have the frequency and channel number crosshatched.
Use of the NAVAID status "Shutdown" is only used
when a facility has been decommissioned but cannot
be published as such because of pending airspace actions.