Kevin Heinrich sends us a Civil and Map 3D tip that applies when using geo-referenced objects.
"Do you ever wonder what the pesky circle with lines through it is? The one that just won't go away, no matter how much you zoom in to it or how many times you try to erase it? This pesky marker, commonly used when exporting drawings or data to Google Earth, is referred to as a geo-marker. It is used to reference an AutoCAD drawing to an exact latitude and longitude. So if you don't care about the exact location, it is easily turned off and forgotten.
"To turn it off, type on the Command line:
(and use GEOMARKERVISIBILITY 1 to turn it on again)."
Notes from Cadalyst Tip Patrol: This nice thing about this icon is that it tells you that there is geo-referenced data in your file. However, it is annoying. It doesn't plot, but it shows up on your screen. This tip works in both Civil 3D and Map 3D, as both can reference SHP files and other geo-referenced data.