A navigational device in an aircraft, ship, or other vehicle.
- I haven't owned an airplane with a navaid in it for over 30 years now.
- The second scenario assumes that all conventional navaids are still operating but that 80 percent of aircraft will be GPS equipped.
- The defining GPS waypoints have satellite-derived coordinates that are co-located with the ground navaids for that approach.
1950s: from navigational aid.
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