I've hidden water in the Northern Tenere and tried to find it a year later.
When we relied mainly on GPS (I say mainly because GPS was marking a point 30 meters from a balise), we could not find the stash and we dug up a circle of sand about 3 or 4 m in diameter.
We did find the water which was hidden among rocks - and the water was fine to drink a year later (a lot of ground water in the Sahara fell as rain about 125 000 years ago!). GPS helped find the rocks, but not the water amongst the rocks. We would also have found the rocks without the GPS.
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