ITU-R SM.1051-4 PDF

This Recommendation describes the priority that should be given to interference detected in the frequency band 406-406.1 MHz by Administrations and their monitoring authorities because interference impairs the detection and geolocation of actual distress beacons. Cospas-Sarsat is an international satellite-based search and rescue (SAR) distress alert system which detects and locates emergency beacons activated by aircraft, ships and backcountry hikers in distress worldwide. The Recommendation provides additional references to the ITU Monitoring programme for 406 MHz, as well as references to Report ITU-R SM.2258. Following the revision of Resolution 205 (Rev.WRC-15), this Recommendation provides a methodology to monitor the electromagnetic environment in the adjacent frequency bands 405.9-406 MHz and 406.1-406.2 MHz frequency bands.