TheSystem for Differential Corrections and Monitoring (SDCM), is thesatellite-based navigation augmentation system operated by Russia'sRoscosmos space agency to augment the precision of theGLONASS satellite navigation system.[1] It uses theLuch Multifunctional Space Relay System to transmit correction data.[2]
SDCM's service area covers theRussian Federation. As of 2021[update] it had not yet been certified for use for public aviation.[3]
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