surveillance services
as defined in Commission Implementing Regulation (EU) 2017/373 of 1 March 2017 laying down…, Article 2, point (38)
38. "surveillance services" means those facilities and services used to determine the respective positions of aircraft to allow safe separation;
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Also defined in
- Regulation (EC) No 549/2004 of the European Parliament and of the Council of 10 March 2004 laying down the framework… 32004R0549, Article 2, point (38)
those facilities and services used to determine the respective positions of aircraft to allow safe separation