Birds appear much different on the radar screen
than hard, solid contacts like other vessels, buoys, rain, and land.
However, the linkage is not direct: Controllers have to search for the aircraft on the radar screen to coordinate the representations.
It is important to note that the planned and current sequences of aircraft are not linked to each other and that changes on the radar screen are not reflected by changes to the strips.
In reality, there is no commonality or consistency from one search firm to another in terms of who qualifies to be on the radar screen
and who is not.
When the NCAR group spotted precursors on the radar screen
, they issued an advance notice that a microburst would reach the surface within 5 minutes.
Helicopters have spotted bodies floating on the sea and one lifeboat carrying three people in the vicinity of where the ship, the Salaam 98, was last seen on the radar screens, Egyptian maritime officials said.
Its last position on the radar screens was 62 miles from Duba.
The Finnish air traffic control however acted wrongly in not telling the aircraft that it did not appear on the radar screens in the air traffic control tower.
The danger came from the fact that the aircraft did not show on the radar screens despite having been in the air for about five minutes.
A new 13-floor office building at Helsinki-Vantaa airport, Finland reportedly causes reflections and phantom images on the radar screens
of the primary radar at the air traffic control.