{
  "url": "https://openlegislation.uk/eu-regulation-2011-1207/annex-II/part-2/division-3",
  "json_url": "https://openlegislation.uk/eu-regulation-2011-1207/annex-II/part-2/division-3.json",
  "legislation": "eur/2011/1207",
  "legislation_title": "Commission Implementing Regulation (EU) No 1207/2011 of 22 November 2011 laying down requirements for the performance and the interoperability of surveillance for the single European sky (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2011-1207",
  "path": "annex/II/part/2/division/3",
  "kind": "division",
  "number": "3",
  "heading": "The following data items shall be made available to the transponder and be transmitted by the transponder via Version 2 of the extended squitter (ES) ADS-B protocol in accordance with the formats specified in ICAO document 9871 (2nd edition):",
  "text": "(a) 24-bit ICAO aircraft address;\n(b) aircraft identification;\n(c) Mode A code;\n(d) special position indication (SPI) using the same source as for the same parameter specified in Part A;\n(e) emergency status (general emergency, no communications, unlawful interference) using the same source as for the same parameter specified in Part A;\n(f) ADS-B version number (equal to 2);\n(g) ADS-B emitter category;\n(h) geodetic horizontal position in accordance with the world geodetic system revision 1984 (WGS84) latitude and longitude, both while airborne or on the ground;\n(i) geodetic horizontal position quality indicators (corresponding to the integrity containment bound (NIC), 95 % navigation accuracy category for position (NACp), source integrity level (SIL) and system design assurance level (SDA));\n(j) pressure altitude using the same source as for the same parameter specified in Part A;\n(k) geometric altitude in accordance with the world geodetic system revision 1984 (WGS84), provided in addition and encoded as a difference to pressure altitude;\n(l) geometric vertical accuracy (GVA);\n(m) velocity over ground, both while airborne (east/west and north/south airborne velocity over ground) or on the ground (surface heading/ground track and movement);\n(n) velocity quality indicator corresponding to navigation accuracy category for velocity (NACv);\n(o) coded aircraft length and width;\n(p) global navigation satellite system (GNSS) antenna offset;\n(q) vertical rate: barometric vertical rate using the same source as for the same parameter specified in the data item in point 2 (g) of Part C when the aircraft is required and capable to transmit this data item via the Mode S protocol, or Global Navigation Satellite System (GNSS) vertical rate;\n(r) mode control panel/flight control unit (MCP/FCU) selected altitude using the same source as for the same parameter specified in Part C when the aircraft is required and capable to transmit this data item via the Mode S protocol;\n(s) barometric pressure setting (minus 800 hectoPascals) using the same source as for the same parameter specified in Part C when the aircraft is required and capable to transmit this data item via the Mode S protocol;\n(t) ACAS active resolution advisories when the aircraft is equipped with TCAS II using the same source as for the same parameter specified in Part A.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2011/1207/annex/II/part/2/division/3",
    "retrieved_at": "2026-11-01T14:49:44.507166+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}