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

vertical positional data (based upon pressure altitude received from the aircraft);

operational identification data (aircraft identity received from the aircraft like aircraft identification and/or Mode A code);

supplemental indicators:

• emergency indicators (i.e. unlawful interference, radio failure and general emergency);

• special position indicator;

surveillance data status (time of applicability of vertical position data).