The above bottles are in alphabetical order A to F from left to right
To find the coordinates you must identify the gas which is in the bottles.
Once you have solved this part,add up the number of letters which descibe the gas.
Next add or subtract to this number as shown below to find your coordinates.
A -1 =
B+0=
C-7=
D+2 =
E -9 =
F-11 =
Move now to the finishing line:-
S36 54.ABC
E174 41.DEF
The above co-ords are of course bogus
The cache contains notebook pen etc etc
Would you believe parking is available opposite a GAS station.