The cache is NOT at the published co-ordinates.
They are for somewhere to park but it is actually possible to drive close to GZ before a bit of a climb. There is only a logsheet in the container so please bring a pen.
You will need to solve the below puzzle to work out the location of the cache itself.
I aM Groot
I am groot
I am GRoot
I am groot
I am GroOt
I am GrOot
I aM Groot
I am Groot
I aM Groot
I Am Groot
I am GRoot
I Am Groot
I am GrooT
i am Groot
I am GroOt
Many thanks to Brother Colin for introducing me to this puzzle.