Nathan,
Generally speaking network are adjusted to certain datum, but they all broadcast WGS84 (Lat, Lon, Ellipsoidal Height.In other words, the network receivers track the same information from the satellites than your Emlid Reach does. It is the software that takes care of transformations. In RTKLib (and Reachview on the RTK side) the options are limited to WGS84 and a couple of vertical datums (ERMS96 and something else I can’t seem to remember(maybe ellipsoidal height?). So, after you get your coordinates processed in RTKlib, then you will need one of the methods others in this thread have highlighted to be able to fit the coordinate system you are intended to use or your final deliverable coordinate system is.
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