Mystery in Marin Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(regular)
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I was on Bart today and overheard 2 cachers talking about a new puzzle cache in Marin. Apparently they devised a way to convert numbers into letters, but I don't know how they do it. I heard one of them say GIA KYX, which must be the masked coordinates for stage 1, and the other made reference to either Mother Nature or The Father of Numbers, I couldn't exactly hear which.
They said the cache is a 2-stage multi, and the 1st stage is not at the posted coords on the cache page. The cache has 10 Geocoins, 1 GJTB, and 3 regular TB's (among other goodies)! If only I had their conversion tool, then I'd be able to get the coords for both stages and go grab all that booty. Maybe one of the local Marin cachers can figure this one out.
Additional Hints
(Decrypt)
Fvk-qvtvg purpxfhz sbe gur fbyirq chmmyr pbbeqf sbe gur 1fg fgntr vf 32.
Fvk-qvtvg purpxfhz sbe gur fbyirq chmmyr pbbeqf sbe gur Svany fgntr vf 26.
Fgntr 1 (uvqr): snpr gur clenzvq naq tb evtug, gura hc nobhg 30 srrg. Jurer qb nvecynarf fyrrc?
Svany fgntr (uvqr): gra gb svsgrra srrg orybj gur ynetr obhyqref naq fyvtugyl rnfg, haqre yrns qroevf orgjrra n ynetr ebpx naq n gerr.