The DEMETER Advanced training, with a duration of 3 days, is designed for users who have followed the Introductory DEMETER course [NAV-DEM-INTRO] and for experienced DEMETER users. The Advanced course will start with a PBN overview and a discussion on GNSS, its vulnerabilities and the role of terrestrial aids in GNSS reversion. The navigation infrastructure assessment process is explained based on ICAO and Eurocontrol Guidance Material, including how this process interfaces with other actors required for PBN implementation. Following this discussion, the participants will be shown how to use DEMETER for infrastructure assessment and optimization through the use of  ‘hands on’ exercises. This will include the set up and configuration of DEMETER (navaid and terrain databases), facility coverage, area RNAV performance and procedure-specific RNAV performance assessments. All the various tool functionality, including flight inspection data interfaces and the navaids siting tool, will also be explained and demonstrated. On the last day the participants will be given the possibility to use DEMETER in a complex exercise for identifying potential solutions for the infrastructure optimization in a given environment.