Oh, please, oh, please, oh, please! Any chance you're planning to do the hunt this Saturday? I haven't done a scubacache in far too long, and I could certainly fit it in to *this* Saturday. I don't even care about logging FTF (that's all yours). I've even got qualifications: I've done scubacaches in several states, and I'm even a NAUI divemaster (so it shouldn't hurt to have me along).
As for techniques, one of my favorite for this type of scubacache hunt is to go to the coordinates on the surface. You bring a spool with a weight tied to the end, and when you get to ground (water?) zero, you spool it down to the bottom. Once you're on the bottom, you can start your search pattern from a known point, which makes it much easier to locate than using the "well, I think this should be about it" method.
Anyway, I'll be watching this thread, of course, and if the plan ends up being for this Saturday, I'd gladly drive the eight hours or so to join in on the hunt for GC1HEGZ. (If the plan's not for this Saturday, I'll try to restrain myself... although I don't have plans yet for this weekend. :biggrin