The apparent dip script mentioned a few posts below has some issues with due north trending cross section lines. It's calculating bogus apparent dips. I need to revisit it at the conclusion of Winter quarter to fix bugs. Until then, I really don't recommend relying on it. Unless, of course, you want to make it better. But then I'd recommend just writing the script from scratch, since I used the rapid prototyping model. It is really ugly work.
Just a warning.