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The Radio Technical Commission for Maritime Services (RTCM),founded in 1947 as a U.S.State Department advisory committee,has been producing standards and recommendations related to all aspects of maritime radio navigation.Today RTCM is an independent non-profit organization which produces standards and recommendations that are used internationally and many of which are incorporated as either a basis of requirements by other international standards organizations and many of which are incorporated into government policy and law.The main work of standards development within RTCM occurs within their Special Committees (SC).One such Special Committee (i.e.,SC-104) focuses on Differential Global Navigation Satellite Systems (DGNSS),which includes GPS,BeiDou,GLONASS,Galileo,QZSS,and others.In its early days,the main emphasis of SC-104 was on the now famed code based Differential GPS (DGPS) standard which is still in use throughout the world for Safety Of Life At Sea (SOLAS) applications.The standards produced by SC-104 were so successful that the committee was asked to address more non-maritime and non-SOLAS related applications and to include other constellations.Today,standards and recommendations produced by RTCM include not only SOLAS maritime,but many applications ranging from codephase based differential corrections through the high-accuracy multi-constellation/multi-frequency carrier based services (such as Real-Time Kinematic (RTK),Network RTK,Transformations,Precise Point Positioning (PPP),and the Network Transport of RTCM via Internet (Ntrip)).Recently,SC-104 has been actively adding to its standards the new constellations,such as BeiDou,and new signals,including many that are planned.This paper will discuss the plans and challenges to introduce BeiDou into RTCM DGNSS standards.This paper will also provide a brief history of RTCM SC-104,its current activities,and its work in progress.