Identifying & Defining Coord System

Discussion created by amynewsam on Nov 4, 2016
Latest reply on Nov 4, 2016 by amynewsam

I'm trying to make a map package, and the error comes up "Layers dataset is using an unknown coordinate system."  When I right-click and select "help" it takes me to an ESRI page (error 00047) where it first tells me I must 

  • Define the coordinate system of the layer's dataset.

and then goes into detail on how to change the map's coordinate system, which is not what I need to do (the map is WGS 1984 UTM zone 10N).  When I go into the source data in the layer properties, it does not indicate any way to change the coordinate system there.  How can I do this?  How can I know that it is the correct coordinate system?  If I can't find the correct coordinate system, is that the end of my project?