philip2004uk
You are right, however, somebody has to tell you that the squawk you see is related to data from the FPL list and to pass the "estimate". Nowadays, flight data, are exchanged, between two adjacent units, automatically, via OLDI (on line data interchange). The problem was that Turks, as well as Bulgarians, didn't have any idea what the target was. When pilots called us and said the call sign, we didn't have problem in finding them, because flight plan was regularly filled and distributed. Pilot said that they were transferred to wrong frequency shortly after departure. Why they didn't come back to previous freq. or, why they didn't use, or listen to, 121.5 I wouldn't know (Sofia was repeatedly calling them, but with no reply).