This geodetic reference point was created on the occasion of the 100th death anniversary of Friedrich Robert Helmert and can be used to evaluate the position accuracy of any GNSS (Global Navigation Satellite System) device (for example smartphones).


The reference point is located on the Schlossplatz (palace square) in Freiberg in front of the entrance to the Krügerhaus.

Location (OpenStreetMaps)   Location (GoogleMaps)


Place your smartphone or GNSS device in the middle of the plate and compare the coordinates from your device with the coordinates that are engraved on the plate. In some occasions, it is possible that your device requires some time before its positional coordinates are displayed. Furthermore, it can be useful to walk with the device around the area of the reference point before placing it on the plate.

For short distances near the reference point, one Arcsecond approximates to 19,5 m in longitude or 30,9 m in latitude.

The coordinates of the geodetic reference point are are as follows:

WGS84 (World Geodetic System) Link (Wikipedia)
Degree decimal [Longitude Latitude]:
Degree minutes:
Degree minutes seconds:


UTM (Universal Transverse Mercator) Link (Wikipedia)
33 U
5642217,49 m
383327,85 m

Online service for converting coordinates:

Determine position via your browser

By clicking the button below, your web browser is going to determine the geographic location of your device. It is possible that you have to give permission to this tool to access your location. No positional data will be send to third parties.

Geographic postion: to be determined
Distance to geodetic reference point: unknown

Friedrich Robert Helmert

Helmert was born in Freiberg, Kingdom of Saxony. After schooling in Freiberg and Dresden, he entered the Polytechnische Schule, now Technische Universität, in Dresden to study engineering science in 1859. Finding him especially enthusiastic about geodesy, one of his teachers, Christian August Nagel, hired him while still a student to work on the triangulation of the Erzgebirge and the drafting of the trigonometric network for Saxony. In 1863 Helmert became Nagel's assistant on the Central European Arc Measurement. 

Due to his efforts in regard to further development and connection of mathematical and physical theories, he is considered as one of the founders of modern geodesy.

More information about Friedrich Robert Helmert: Link (Wikipedia)