These co-ordinates are not the location of a cache, but your nearest place for parking
The Public Grounds series consists of 5 hidden containers, all the same in appearance and contents. All they contain is a log, at the top of which is a letter and a number. For example, Z=5. This information you need to note down in order to work out the co-ordinates of the Bonus location which is a different container and will contain: Log, Pen, FTF Certificate, Cache Card, and Swaps. Now for the important part, the location of the bonus container:
N053° 23.CBE
W000° 46.ADC
So you are looking for E,B,C,A,D, once found replace with the above, and hey presto, the location!!!
You will need a writing implement for the first 5 caches.
Cache containers can be found wedged in tree branches, no climbing required though, be aware of bramble and hawthorne