navigational aids and bridge system
radar and navigational aids system
The crash was a direct result of inadequate navigational aids.
The priority of the coast guard is in repairing navigational aids.
Negligence or other wrongful acts in the exercise of the functions of departments responsible for the maintenance of beacons or other navigational aids.
Not having proper navigational aids the pilot had been unaware of the changing conditions and had flown the plane right into the eye of the tropical storm.
