The above co-ords will put you within tens of meters of the cache, once you solve the sudoku puzzle the blue squares, read top to bottom left to right, will give you the decimal portions of the real hiding place.
Replace the decimal portions of the listed lat/longs to find the cache. e.g. if the South location is 12'34.456 replace the 456 with the first 3 digits highligted in the puzzle, and do the same for the Eastings using the remaining 3 digits.
seeing as this is an easy cache, it you find the coords and still cant find the cache, look for the multi trunked redgum with a hollow burnt in its base. the cache is a few paces from there.