Duvik! You rock! Thanks so much for this--especially since it's on subterranean mapping (which is for some reason only lightly treated in our forum).

If you ever feel reallly crazy, you may want to add some "in process" shots to your tutorial, too, for those of us who are more visual.

Thank you so much for posting this!

PS: in your thread title make sure to specify the program your tutorial utilizes, too, ok? Makes easier surfing/searching.