To solve this one, you need to work out how the five images below are connected. Numbered 1 to 5 from left to right.
A=the number of letters in the connecting word in picture 1, the image on the left of the montage.
B=the number of letters in ........ picture 2
C=the number of letters in ........ picture 3
D=the number of letters in ........ picture 4
E=the number of letters in ........ picture 5
F=the number of letters in the noun (in its plural form) which connects and describes all 5.
The cache can be found at : N54 58.Y W001 40.Z
Where Y = ((B + C) x E x F) - A and Z = ((A + E) x (D + E - B)) + F
You can validate your puzzle solution with certitude.