Spectra Precision ProMark 800 Reference Manual - Manual (Page 103)

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RTK Implementation
RTK Position
Output Rate
In Time-tagged RTK mode, clearly the rover’s position output
rate is equal to the RTK correction data output rate set at the
base. It will also depend on the installed firmware options, if
applicable to the Spectra Precision equipment used.
In Fast RTK mode, the rover’s position output rate can be a
multiple of the RTK correction data output rate. It is
controlled by a specific user-settable parameter and will also
depend on the installed firmware options, if applicable to the
Spectra Precision equipment used.