v4.0
Added new questions for ADS-B, Washington DC FRZ & SFRA, aircraft interception procedures, 406 MHz ELTs, BasicMed, Final Approach Runway Occupancy Signal system, flight simulators (FFS, FTD, AATD, BATD), runway status lights (REL, THL, RIL), Chart Supplement publication, WAAS approaches (LPV, LNAV/VNAV, LNAV, LP, LNAV+V, LP+V, RNAV RNP 0.3), IFR GPS database currency, Q-routes, T-routes, and ATC separation of VFR versus IFR aircraft.
Revised existing questions to correct errors and obtuse wording. Revised graphical images for better clarity and focus. Removed outdated questions.
Updated for macOS 10.15 Catalina and compliance with macOS Dark Appearance.
