The cache is not at the above coordinates so there is no need to bring a boat or your togs.
Fill in the grid so that each cell contains a digit. A bold outline cluster of two cells contains the digits 1 and 2, a cluster of three cells contains the digits 1, 2 and 3, and so on. No same digit appears in any neighbouring cell, not even diagonally.
The 1 litre Sistema cache can be found at S 42 41.ABC E 171 11.XYZ, where:-
A = A3 + F5 - B7 + H13
B = (J15 + C14 + H6) / (D15 + A10)
C = G13 + F8 - (D9 + A8)
X = A1 + B2 + C3 - J3
Y = (B12 + F10) (J4 - F4) / (C7 + F15)
Z = (C4 + E5 + E11) / (D3 + H7 + E13)
UPDATE 6 March 2018 - My apologies to those who have already downloaded this cache. There were a few errors in the coordinate degrees and whole minutes caused by incorrect cutting and pasting.
