---
title: "GM1 to AMC1 ATS.TR.155(e) ATS surveillance services — SPECIFIC REQUIREMENTS FOR PROVIDERS OF AIR TRAFFIC SERVICES, ATM/ANS · Avioverse"
description: "INFORMATION REGARDING TRAFFIC ON A CONFLICTING PATH With reference to point (a)(1) of AMC1 ATS.TR.155(e):"
url: "https://avioverse.aero/regulations/easa/atm-ans/part-ats/subpart-b/gm1-to-amc1-ats-tr-155-e-ats-surveillance-services"
---

# GM1 to AMC1 ATS.TR.155(e) ATS surveillance services

SPECIFIC REQUIREMENTS FOR PROVIDERS OF AIR TRAFFIC SERVICES · Regulation (EU) 2017/373 · EAR revision 12 Mar 2025

GM Guidance material

## GM1 to AMC1 ATS.TR.155(e) ATS surveillance services

INFORMATION REGARDING TRAFFIC ON A CONFLICTING PATH

With reference to point (a)(1) of AMC1 ATS.TR.155(e): 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.

GM — Regulation (EU) 2017/373 · ED Decision 2020/008/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

[All rules in SUBPART B — TECHNICAL REQUIREMENTS FOR PROVIDERS OF AIR TRAFFIC SERVICES (ATS.TR)](https://avioverse.aero/regulations/easa/atm-ans/part-ats/subpart-b)

Consolidated from the EASA Easy Access Rules (revision 12 Mar 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.