MOON is a tool developed by EUROCONTROL for performance monitoring. MOON listens to VHF datalink (VDL) Mode 2 channels via remote monitoring units. It provides VHF datalink / Aeronautical Telecommunications Network (VDLM2/ATN) statistics and alarms for monitoring and subsequent analysis. MOON also provides key information for further capacity planning and multi-frequency VDL 2 deployment.
It has been instrumental in the detection and investigation of controller-pilot datalink communications (CPDLC) VDL Mode 2 implementation issues affecting interoperability or channel occupancy.