In ArcGIS runtime 10.2.7 you could specify a GPS location provider but how do you do this in Quartz (v100.0)?
It works similar manner in 100.0. Have a look to https://developers.arcgis.com/net/latest/wpf/sample-code/displaydevicelocation.htm and https://developers.arcgis.com/net/latest/wpf/api-reference//html/N_Esri_ArcGISRuntime_Location.htm
It seems that I just have to extent the LocationDataSource class and override the OnStartAsync and OnStopAsync methods so is quite similar to 10.2.
Retrieving data ...