---
title: "GM1 to AMC1 DAT.OR.100(a) Aeronautical data and information — SPECIFIC REQUIREMENTS FOR PROVIDERS OF DATA SERVICES, ATM/ANS · Avioverse"
description: "NON-AUTHORITATIVE SOURCE (a) A non-authoritative source may be an organisation other than those defined in point 32 of Annex I, but providing and/or…"
url: "https://avioverse.aero/regulations/easa/atm-ans/specific-requirements-for-providers-of-data/subpart-a/gm1-to-amc1-dat-or-100-a-aeronautical-data-and-information"
---

# GM1 to AMC1 DAT.OR.100(a) Aeronautical data and information

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

GM Guidance material

## GM1 to AMC1 DAT.OR.100(a) Aeronautical data and information

NON-AUTHORITATIVE SOURCE

(a) A non-authoritative source may be an organisation other than those defined in point 32 of Annex I, but providing and/or publishing data derived from data gathering or measuring performed (e.g. by aircraft operators, air crew, DAT providers, or other similar operational organisations, or a combination thereof), transformation of various sources to provide aeronautical data which conform with relevant standards and data quality requirements as specified by the airspace end users.

(b) When validating data from a non-authoritative source, the DAT provider should proceed by using either additional information sources to validate this data (like satellite imagery, data or manuals from other providers, users, military, etc.), or data which has been tested and confirmed through operations.

GM — Regulation (EU) 2017/373 · ED Decision 2017/001/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

[All rules in SUBPART A — ADDITIONAL ORGANISATION REQUIREMENTS FOR PROVIDERS OF DATA SERVICES (DAT.OR)](https://avioverse.aero/regulations/easa/atm-ans/specific-requirements-for-providers-of-data/subpart-a)

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.