crew member identification number(CID) means a number generated by the Union database that identifies a crew member registered in that database and that is unique to the holder;
European hull database (EHDB)means the database provided by the Commission pursuant to Article 25(2) of Directive (EU) 2017/2397 to record and exchange the data on the logbooks referred to in Article 25(1) of that Directive;
metadatameans data processed in the Union database for the purposes of sending or exchanging electronic communications content;
National registersmeans the registers of the Union certificates of qualification, service record books and logbooks and, where relevant, of documents recognised pursuant to Article 10(2) of Directive (EU) 2017/2397, which are established and kept by Member States pursuant to Article 25(1) of that Directive
Union databasemeans the database provided by the Commission pursuant to Article 25(2) of Directive (EU) 2017/2397 to record and exchange data on certificates of qualifications and service record books referred to in Article 25(1) of Directive (EU) 2017/2397 and on certificates of qualifications and service record books recognised pursuant to its Article 10(3);