Navigate / EASA
GM1 to (a)(1) of AMC1 SERA.7002(a)(1)  Collision hazard information when ATS based on surveillance are provided

ED Decision 2016/023/R

In cases where using the terms of the 12-hour clock is not practicable, like when the aircraft is turning, the direction of the unknown aircraft may be given by compass points, e.g. northwest, south, etc.;