Hallo, I figured it out mayself. GeometryEngine.Project is doing the job The GPS coordinates for Parque Jose Marin in Cinefuegos has a lattitude of -80.4531737 and a longitude of 22.1459153. The GPS MapPoint is new MapPoint(-80.4531737, 22.1459153, SpatialReferences.Wgs84) The GPS location is converted using GeometryEngine.Project MapPoint mapped = GeometryEngine.Project(location, SpatialReferences.WebMercator) as MapPoint; The mapped point can be used to create a marker and to set the position. greetings Clemens Hoffmann
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