But alas container at way point 1 has since gone missing so have changed the calculation.
Now at published coordinates you need to note the number on the sign.
Then ADD ABC to the published South coordinates where
A = Last number upside down minus the first number upside down
B = Last number upside down
c = Last number minus the first number
And ADD XYZ to the published East coordinates where
X = Last number
Y = Last number
Z = Last number upside down minus two times the first number upside down
Check sum = 41 (A+B+C+X+Y+Z)
Final is 2 kilometres away so write down your calculation. Lest you forget.
Check your solution 