GPS isnt too bad at either coord but I'll give you a lil help. Stage one is harder to find than GZ. Stage 1 is a small container with a couple items inside (not SWAG) to clue you in to GZ (itself rated probably a D3.5-4). Once you have the coords, it's off to GZ a little further in. GZ is a medium container, well hidden but slightly visible (itself rated maybe a D3) FTF coin WAS present for the taking at GZ :D Using the clues in Stage 1, check certitude below for GZ coord confirmation in the DECIMAL, DEGREES format XX.XXXXXXX -XXX.XXXXXXX. (Don't forget the "-" in front of the appropriate coord). Once validated it SHOULD give you the DEG, DEC and MIN format for GZ waypoint. If not, OR if your GPS uses a different format, DEG, MIN, SEC, use the below link for a GPS converter to add a waypoint into your GPS so you can head to GZ. http://www.gps-coordinates.net/gps-coordinates-converter
You can validate your puzzle solution with certitude.
All else fails, message me...I try to immediately respond if at all possible.