Please be aware the published co-ordinates are a guide only to the general location of the item you seek, however, should you go there you will find yourself at a point where the North South, East West runways of the Bendigo Airport intersect!
Manipulating this image will provide you with numbers needed to complete the following co-ordinates, which in turn will find you at the "Zenith" of a 2 litre cylindrical container holding the usual log book, pen, some small items suitable for exchanging if so required, and hidden in a manner that will be familiar to most geo searchers.
S36 4*.***
E144 **.***
Good Luck.