https://www.geocaching.com/geocache/GC161MV_orni-iii-twedter-feld
GC161MV Orni III: Twedter Feld (Unknown Cache) in Schleswig-Holstein, Germany created by fischlaufen
Geocaching is a treasure hunting game where you use a GPS to hide and seek containers with other participants in the activity. Geocaching.com is the listing...