All you need to do is work out the answers I got and you can then find the cache. Dad told me I got the answers right but one of them was a bit backwards.
Enter the following puzzle solution with the extra maths below in the geocheck and you will be given the all clear hopefully.
S33 A.BC E137 DE.FG
You will need to do a bit more complicated maths, the "C" & "G" figures are double digits but to find the cache you will need to take 4 from the South decimal minutes and 1 from the East decimal minutes before you try the geo-check.