I want to set the base for a Reach RS on a known survey point. The manual states for Manual base location "Manual¶: In this mode you supply an a priori known coordinate by locating the unit above surveyed point. Coordinate has to be supplied in ECEF XYZ or in WGS84 Latitude and Longitude and WGS84 ellipsoid height.

So if in the USA I use an NGS bench mark, the data sheet gives position in NAD88 (L,L) and NAVD88 (elevation) which I am used to and also geoid values for X, Y Z:

GEOID HEIGHT - -26.701 (meters) GEOID12B

AH0147 NAD 83(2011) X - -713,664.139 (meters) COMP

AH0147 NAD 83(2011) Y - -5,595,005.353 (meters) COMP

AH0147 NAD 83(2011) Z - 2,967,765.866 (meters) COMP

I don;t think (although I may be wrong) that these X, Y Z coordinates are the same as ECEF X, Y and Z as the NGS data sheet refers to GEOID12B as the reference.

Any help on this?

Thanks