GLONASSARY

RTCM (numerous versions and types) - refers to an International communication/corrections format (not manufacturer specific), developed by the Radio Technical Commission for Maritime Services; earlier versions were designed for DGPS uses (code-differential), and RTCM v.2 Type 1.8/1.9 was first to offer uncorrected carrier-phase and pseudorange information in the datastream (for RTK use); currently up to version 3.1 with expected advancements in the future. Basically, this is a type of data stream format in which correction messages are transmitted from the base station to the receiver via radio frequency or internet.

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