Plain English Meaning
An older radio navigation system that figures out where you are by timing how long signals take to reach you from several known ground transmitters. Where the timings cross, that's your position.
Full Definition
A ground-based radio navigation system that determines an aircraft's position by measuring the time difference between signals received from a chain of low-frequency transmitter stations. The receiver compares the arrival times of pulses from a master station and one or more secondary stations to compute lines of position, which intersect to give a fix.
Context Anchor
Seen in older navigation equipment, older aircraft manuals, glossary , and discussions of that came before modern .