The complexity of the total air traffic management system imposes requirements for stable and independent networks for transport of all the data. Naviair has therefore established a closed network (CANDI) and an operative IP network (C-NET) through which the various systems can exchange data. CANDI (Civil Aviation National Data Interchange) is Naviair’s closed digital WAN network. CANDI bundles the IP network, together with Naviair’s many analog channels (typically between Kastrup and destinations in Denmark) into a small number of digital high-speed connections.

If failure or other interruption should occur, the connections are always ensured an alternative transmission path because of the natural net structure in the TDC network. In this way safe arrival of data is always ensured. C-NET is Naviair's closed digital LAN network, the primary purpose of which is to create a connection between the many systems involved in Naviair’s total air traffic management system. In addition to the operative systems in the Naviair facility in Copenhagen, C-NET also supplies the systems in Roskilde and Billund airports.