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System for Differential Corrections and Monitoring
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<p>The System for Differential Corrections and Monitoring (SDCM), is the <a href="/facts/Satellite-based_navigation_augmentation_system/cNrjcVVv">satellite-based navigation augmentation system</a> operated by Russia's <a href="/facts/Roscosmos/GzWfae7U">Roscosmos</a> space agency to augment the precision of the <a href="/facts/GLONASS/sLh1vQ6p">GLONASS</a> satellite navigation system. It uses the <a href="/facts/Luch_Multifunctional_Space_Relay_System/GyAn64Ao">Luch Multifunctional Space Relay System</a> to transmit correction data. </p><p>SDCM's service area covers the <a href="/facts/Russian_Federation/jfkCwyxn">Russian Federation</a>. As of 2021<a href="https://en.wikipedia.org/w/index.php?title=System_for_Differential_Corrections_and_Monitoring&action=edit">[update]</a> it had not yet been certified for use for public aviation. </p>