Plain English Meaning

An IFR low-altitude route that you can only fly if your aircraft has approved GPS or other area navigation equipment, because it isn't built around traditional ground stations like VORs.

Full Definition

A published low altitude IFR airway designed to be flown using area navigation (RNAV) equipment rather than ground-based navigation aids. These routes appear on IFR En Route Low Altitude Charts and are identified with a 'T' prefix (T-routes), and they require the aircraft to have approved RNAV capability — typically GPS — to fly them.

Context Anchor

Seen on IFR En Route Low Altitude charts when selecting, filing, or accepting an instrument route .