---
title: "GM2 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)(4) of AMC1 ATS.TR.155(e):"
url: "https://avioverse.aero/regulations/easa/atm-ans/part-ats/subpart-b/gm2-to-amc1-ats-tr-155-e-ats-surveillance-services"
---

# GM2 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

## GM2 to AMC1 ATS.TR.155(e) ATS surveillance services

INFORMATION REGARDING TRAFFIC ON A CONFLICTING PATH

With reference to point (a)(4) of AMC1 ATS.TR.155(e): The level may be described either as a flight level, altitude or height, or as a relative vertical distance from the aircraft provided with traffic information (e.g. 1 000 ft above or 1 000 ft below).

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.