This is the bonus for Adventure Lab Cache ~ Coed Craig Ruperra the cache is not at the posted co- ordinates these are for the Ruperra Castle.
https://adventurelab.page.link/1Srv
When you have all the bonus letter values from the Adventure Lab Stages input them into the equation below to find physical bonus cache
N51 34.ABC W003 07.D(C-E)E
We hope you enjoyed the walk as much as we do.