IFR low- and high-altitude enroute chart legends, symbols, examples, and procedures.
NAVIGATION AND COMMUNICATION BOXES - COMMON ELEMENTS
RCO Frequencies
Low-enroute nav/com box with controlling FSS name (AK) — source page 77.
NAVAID Name, SSV(s)
FREQ, Ident, CH, Morse Code
Latitude, Longitude
Controlling FSS Radio or FSS Name (AK)
RCO Frequency
Single Frequency
Multiple Frequencies
Frequencies transmit and receive except those followed by R
and T:
R - Receive Only T - Transmit Only
NAVAID Box
Thin line NAVAID boxes without frequency(s) and FSS radio name indicates no FSS frequencies available.
(AK only) Shadow NAVAID box indicates NAVAID and Flight Service Station (FSS) have same name.
RCO Frequencies
High-enroute nav/com box with controlling FSS name (AK) — source page 77.
NAVAID Name
Frequency, Ident, SSV(s), Channel
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