The cache is NOT at the posted coordinates.
The ancient Egyptians used hieroglyphics as their means of written language. This included numbers as well. I can't imagine having to draw pictures to do math. I would fail! Clearly the Egypitans knew their stuff. No way to engineer and build those awesome pyramids without a bit of mathematics. Slave labor didn't hurt, either.
The 38o 53. and 119o 43. are givens.