1.   On the way into Cali, the tasks included adapting to a nonstandard approach, descending into clouds and locking the autopilot onto navigational beacons.

2.   Radio stations went off the air, lest their signals serve as navigational beacons to enemy aircraft.

3.   That modification is called the Solberg Mitigation Proposal, after a navigational beacon at Solberg, N.J, near the town of Raritan.

4.   The tower then gave the plane instructions to report in when it crossed over a navigational beacon on the ground.

5.   When that letter was entered into the flight management computer, the screen responded with a list of six navigational beacons.

6.   A preliminary report by the National Transportation Safety Board found nothing wrong with the navigational beacons.

7.   Dunn believes pilot Nicholas Tafuri guessed when he went to set the computer for a navigational beacon named Rozo, which would have guided the plane to Cali.

8.   Russian authorities may have lost track of similar strontium batteries powering navigational beacons on the Pacific and Arctic coasts.