The ICAO Council adopts standards and recommended practices concerning air navigation, its infrastructure, flight inspection, prevention of unlawful interference, and facilitation of border-crossing procedures for international civil aviation.
EAD issues No Objection Certificates (NOCs) or permits for construction and operation to developers or companies involved in. development and infrastructure projects to ensure that they implement necessary measures to protect the environment during. the Construction, Operation, and Decommissioning phases of the project.
The Network Access Code or NAC is a feature of Project 25 digital radios similar to CTCSS or DCS for analog radios. That is, radios can be programmed to only break squelch when receiving the correct NAC. NACs are programmed as a 3 digit hexadecimal code that is broadcast along with the digital signal being transmitted.