A common use of “symmetric algorithms” is confidentiality of data. “System tracks” (6) means processed, correlated (fusion of radar target data to flight plan position) and updated aircraft flight position report available to the Air Traffic Control centre controllers.
“Utilisation” (NGT, NTN, toutes catégories) recouvre l’exploitation, l’installation (y compris l’installation in situ), l’entretien (vérification), la réparation, la révision et la rénovation.