Very high frequency omni-directional radio range (VOR), combined Very High Frequency Omni-Directional Radio Range (VOR) and tactical aircraft control and navigation (TACAN) navigational facility (VORTAC), and TACAN aids are classed according to their operational use. The three classes of NAVAIDs are: T-Terminal, L-Low altitude, H-High altitude.
(FAA4)
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