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On the sign:
[logo of Frankfurt Municipality] STADT FRANKFURT AM MAIN STADTVERMESSUNGSAMT
Lage GPS - Referernzpunkt 50° 06,657’ nördl. Breite 08° 40,912’ östl. Länge
UTM-Koordinaten 32 477 252,40 East 5 551 015, 98 North
The measurement office of the city of Frankfurt specified this place as a reference and reset point for GPS devices. The exact location of the point appears on the sign, so you can check the accuracy and bias of the GPS devices relative to the real point.
The sign was placed on June 13, 2014 and is 40x40 centimeters in size, and is located in a central location in the city, so it is accessible and available to the public.
Translation of the text on the sign: TOWN FRANKFURT AM MAIN CITY SURVEY OFFICE
Position GPS - reference point 50° 06.657’ north latitude 08° 40.912’ east longitude
UTM coordinates 32 477 252.40 East 5 551 015, 98 North