This question may have been asked, but i have looked and looked and cannot find much information on this topic. According to another thread all data that is collected in the ArcGIS collector app is captured using the web mercator auxiliary sphere projection and then is reprojected to the native projection on upload. Here is the link to the thread Projections Using ArcGIS for Collector . Has anyone had issues with the accuracy of the data collected? Has anyone discovered a work-around to be able to collect data in another projection? We are using our own ArcGIS server, with ArcGIS Online for map delivery to collector. Thanks for any advice or help.