Starting with Reach RX firmware 2.11 and Emlid Flow 15.2, Reach RX supports orthometric height output. You can now stream NMEA data with elevations referenced to mean sea level directly to ArcGIS Field Maps and other third-party applications that don’t support geoid corrections.

This is especially useful for construction, utility, municipal, and surveying workflows that require orthometric heights. You can collect centimeter-accurate positions with the elevations required by your GIS project, without converting ellipsoidal heights afterward.

To set it up, enable orthometric height output in Emlid Flow and select the required vertical datum. Then, in Field Maps Designer, configure your web map by adding a feature layer with Z-values enabled. Once the Reach RX is connected to ArcGIS Field Maps, the orthometric height will be recorded for each collected object.

For setup details, see the news about orthometric height output with Reach RX2.