The listed coordinates are the start of a trail which has more effect when done at at night. Here you will find written the coordinates of the first of 3 meals, which you can read with the aid of a Black Light. Coordinates will be on a double sided plastic tag inside the container. Final stage contains the log book.
Be aware that the terrain is mostly in woodland. The ground may be soft, it is undulating with some steep banks, branches, roots and generally you will need to watch your footing. There is water and a footbridge with a barrier on one side only near the start. Entry into the deep, dark woods is entirely your choice, take care, if in doubt dont do it.
As this is woodland there may be some "looseness" with coordinates at times but if you are doing this at night or at least in gloomy conditions there may be visual indicators to help you when using a UV torch in Scooby Doo or CSI fashion.
Be careful and remember to a Zombie your brain is the best bit.