I was exposed and trained on various systems that facilitate air navigational services such as communications, navigation, surveillance and associated auxiliary equipment.Communication systemsHF and VHF Radio Transceivers, Voice Communication Control System ( central control and distribution equipment for radios and telephones), Voice Logging System, Aeronautical Information Data Processing System and Flight Management System, Air Traffic services Message Handling & switching system and the V-SAT Systems.Ground Navigation SystemsNavigational Aids like instrument Landing System (ILS), VHF Omni-directional radio range and radio beacons and Distance Measuring, Equipment.Surveillance SystemsThe RADAR (primary and secondary) system and associated processors and Flight Data Management for Air Traffic Control Operations. 4. Auxiliary EquipmentElectrical power supply systems (voltage regulators, UPS, Electrical distribution panels) and air conditioners.