@FJDT And here I find the answer, confirmed. ReachView v2.21.2 - #107 by agrimgalina Where it states that when using RS2’s in RTK mode, for both Reachview dev versions 2.21.1 and 2.21.2 there is indeed an issue where the base height above mark is being ignored.
There is no user feedback there to determine if this issue also impacts RS+ or RS.
I’m confident Emlid will address this in a future update.