Follow wadi Gnai uphill, passing 2 side wadis on your right where there are tea stops for the quad bikes. Continue until you see on your right a grey basalt crack with a palm and tamarisk plant a few metres higher than the wadi floor.
There is a short, simple scramble to get to the level of the geocache. To your left is a wet wall often covered with moss. To your right, at about head height, behind a tamarisk plant start looking.