Easy find off the powerline trail south of Thunderbird Drive.
Drive up Thunderbird Drive and park where the powerlines cross. Alternatively, continue up Thunderbird Drive and park in the pullout on the right just past the intersection with Teal Loop. The trailhead is on the right side of the intersection. A short distance after crossing the small bridge, the trail forks. Continue to the right and up the hill to find "Old Fort" GC1VVTX, or continue straight and follow this trail until it arcs around to meet the powerline trail (and grab Thunderbog GC48NNH on the way). Cache should be easy to locate, but watch out for sticker bushes in the vicinity. Don't forget to join
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Nzzb pna haqre n fyvtug bireunat ng gur onfr bs fbzr ovepu gerrf.