1.   The crash was a direct result of inadequate navigational aids.

2.   But for Arab compasses, navigational aids, instruments and charts, Columbus would never have discovered America.

3.   And it adds a small toolbar on the right side of the dialog boxes, with numerous other navigational aids.

4.   Alaska, like Colombia, has rugged terrain and areas with few ground-based navigational aids and has poor visibility in many places.

5.   But it is far from universal, and only cynics would suggest that it is an essential navigational aid to finding the muse.

6.   But radio problems left the crew without navigational aids in near-zero visibility.

7.   Dunbar and a team from NOAH have used the Transquest to help install a new system of navigational aids in San Francisco Bay.

8.   Fly to a specific longitude and latitude in the ocean known as Bette, and draw a bead on the navigational aids on Nantucket.

9.   His only navigational aids were an old tin clock with the minute hand missing and a vast knowledge of the stars.

10.   Much attention has been focused on the fact that a key navigational aid was out of service for maintenance.