# 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), Division 1.2: In addition, all cooperative surveillance chains referred to in Article 4(3) shall provide as a minimum the following surveillance data:

Extent: E+W+S+N.I.

(a) vertical positional data (based upon pressure altitude received from the aircraft);
(b) operational identification data (aircraft identity received from the aircraft like aircraft identification and/or Mode A code);
(c) supplemental indicators:
emergency indicators (i.e. unlawful interference, radio failure and general emergency);
special position indicator;
(d) surveillance data status (time of applicability of vertical position data).

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Source: https://www.legislation.gov.uk/eur/2011/1207/annex/I/division/1/division/1.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1207/annex-I/division-1/division-1.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.