Datum of GNSS (GPS) receivers

26 Jan 2021

GNSS (GPS) receivers such as the Juniper Geode and the u-Blox NEO M8 (that is integrated in our Mesa 3 Windows and other rugged handheld computers) follow the NMEA 4.1 standard and when using SBAS technically provide data based on ITRF-2000 Current Epoch which is equivalent to WGS-84.

If using NTRIP corrections such as with the Juniper Geode then datum may be equivalent to NAD-83.

If needing a datum other than WGS-84 (or NAD-83), then GPS/GIS apps that allow you to collect in other datums include ESRI ArcGIS Field Map, ESRI Arcpad, MapIt Pro, OziExplorer, Cybertracker, and many others. We may be able to provide more options if needed by contacting support@junipersys.com. As an example, for ESRI ArcGIS Field Map you could refer to the “Set up a location profile (optional)” section at the following web page which describes how to apply a Datum Transformation.

https://doc.arcgis.com/en/field-maps/ios/help/high-accuracy-data-collection.htm#ESRI_SECTION1_64A6AF2EFEA14F678194AC57FB9BD1B2

Users often confuse themselves by loading different sets of data (or other geo-referenced layers such as background imagery) that use different map systems (datum, coordinate system, projection, etc.) similar to as described at the following web page.

Geode appears to be inaccurate in good conditions

 

Content of article updated 26 Jan 2021, original article from 28 Feb 2020