appropriate certificate
as defined in Directive 2008/106/EC of the European Parliament and of the Council of 19…, Article 1, point (27) (Definitions)
a certificate issued and endorsed in accordance with this Directive and entitling the lawful holder thereof to serve in the capacity and perform the functions involved at the level of responsibility specified therein on a ship of the type, tonnage, power and means of propulsion concerned while engaged on the particular voyage concerned;