Finding your way to GZ can be from either of two entrances.
Finding the entrances is part of the challenge.
Hence the cache name.
Logical surveying of area will reveal the way.
Using the plaque.....
* A = No of letters in word starting with "B".
* B = No of letters in word starting with "H".
* C = 3rd Number along in the Year mentioned.
* D = The sum of the "M" word minus 1.
* E = the regiment number refered to.
* F = E multiplied by 2.
S 37º 53.ABC
175º 28.DEF
ABC checksum = 17
DEF Checksum = 15
Looking for clear green 400ml container
Contents of Log,pencil and some swaps.
GZ is within 500m from posted coordinates