Hi, I'm tpduden, and Here is (a revision of) my second add-on. NASA Centers marker files for Orbiter 2006, the insanely terrific Space Flight Simulator created by Dr. Martin Schweiger, with add-ons by a cast of thousands.
See the NASA Center Directions word document for more detail:
Simple instructions (assumes you know how to use the visual helpers dialog.
One file: "NASA Centers.mkr"
Put this in the following directory: \Config\Earth\Marker
It was pointed out that a couple of places are off a bit. I remapped them, and added three NASA Deep Space Network sites. Note, the Langley in this add on is NASA Langley Research Center, not Langley AFB. Please take note that they are not one and the same!
Have fun and please give feedback.