A question about projection when creating a new shapefile

Discussion created by SmurphyBrown on Sep 9, 2016
Latest reply on Sep 12, 2016 by GSCUser85

My data frame projection is WGS 84 (taken from the several ESRI basemaps loaded in the data frame). I brought in some GPS points which were taken in NAD27.  They were projected on the fly to match the data frame projection. I need to create a polygon based on these GPS points. I'll eventually need the polygon information to be in NAD27. My question is: because I'm creating a shapefile based on the GPS points in WGS84, do I need to set the new shapefile projection to WGS84? Or can I set the projection to NAD27, then, as I create the polygons, they will be shown correctly in the data frame, and still truly be NAD27?