What does the coast track position symbol indicate?

The coast track position symbol indicates a loss of contact with the radar target. This symbol is used in air traffic control to signify that the radar is not currently receiving data from the target aircraft, often due to the aircraft moving out of range of the radar or due to a temporary loss of radar coverage. When this symbol appears, it alerts air traffic controllers that they need to verify the aircraft's position through other means, such as communication with the pilot or reference to their last known position.

In contrast, standard position tracking signifies that the aircraft is being actively tracked; successful tracking of an aircraft means that its movements are being monitored properly; and clear identification of air traffic indicates that the target is positively identified on the radar, which does not apply in the case of a coast track.