AMC1 SERA.7002(a)(1) Collision hazard information when ATS based  on surveillance are provided

CAA ORS9 Decision No. 1

INFORMATION REGARDING TRAFFIC ON CONFLICTING PATH

(a) Information regarding traffic on a conflicting path should be given, whenever practicable, in the following form:

(1) relative bearing of the conflicting traffic in terms of the 12-hour clock;

(2) distance from the conflicting traffic in kilometres or nautical miles;

(3) direction in which the conflicting traffic appears to be proceeding; and

(4) level and type of aircraft or, if unknown, relative speed of the conflicting traffic, e.g. slow or fast.

(b) Pressure-altitude-derived level information, even when unverified, should be used in the provision of collision hazard information because such information, particularly if available from an otherwise unknown aircraft (e.g. a VFR flight) and given to the pilot of a known aircraft, could facilitate the location of a collision hazard. If the level information has not been verified, the accuracy of the information should be considered uncertain and the pilot should be informed accordingly.