I do a lot of work with Landsat satellites, and want to create layer packages which I can import into ArcGIS Explorer. I created the layer package, and I uploaded it to my content. I then deleted the files off of my computer (to see if it is working). I opened ArcMap, and imported directly off my site, and everything lined up great. However, I did the same thing in ArcGIS Explorer, and I got an error message that the layer package had an Unknown Coordinate System. Now, as I stated, I don't get this problem in ArcMap. What can I do to fix this so that I can run my layer packages in Explorer?