Well the markers are up in Glamis and Gordon's Well. If you dune into some of the major hills (Patton's Valley comes to mind) be careful about crossing some of the big ridges as most of them are not marked off. The best rule of thumb is if you see a marker dune over to it and if you can read it your good to go. If you can't read the sign then your on the wrong side and hurry your butt over to the other side before you get all the dunes closed for us!