Don’t go to the given co-ordinates because this is a puzzle - and you might drown.
This is the first in a series of Cross Number puzzle caches. You will need to complete some arithmetic problems to move from clue to clue through the puzzle. You are given 2 down to get you started.
When solving this and the other puzzles in the series you may find you can not complete an entire number at first, but you may be able to logically determine what one or more of the digits must be. Entering these may help you solve other clues and then you can later complete the unfinished numbers.
The puzzle can be solved logically – no guessing is required, but a calculator will help.
The cache is actually at South 41 1A.BCD East 173 1E.FGH where ABCDEFGH are found by solving the puzzle below.