The cache is not at the posted co-ordinates but you could launch a boat there if you wanted to. You can count on this piece of philosophy to help you locate the cache.
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DON'T WAIT FOR YOUR SHIP TO COME IN, SWIM OUT AFTER IT AND DON'T LOOK BACK.
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The cache can be found at S23 08.*** and E 150 45. *** according to the following.
3/3 4/3 10/1 3/1 10/1 2/1 12/2 7/4 11/4 3/3 5/2 14/4 11/4 1/3 2/3 8/2 2/2 1/1 11/1 1/3 11/4 7/4 11/5 5/2 1/4
16/1 13/1 7/1 15/4 2/1 16/2 3/3 13/3 9/1.