Cache is NOT at the posted coordinates!
Ballard Park is a public park located at 924 Thomas Barbour Drive, Melbourne, Florida and is situated on the Indian River Lagoon and the Eau Gallie River. It contains diverse recreational facilities and amenities, including boat ramps, lighted tennis courts and a pavilion. The park also contains a memorial to naturalist and author Thomas Barbour, who frequented the shell mounds on the park grounds as a boy.
Associated with this cache you will find a number of way points. At each of these way points you will find a sign with a number - they are hard to miss!!
Get the number from the sign (be wary of the arithmetic in the waypoints below)
Cache is located at: NAH FD.GHB WFHF ED.CKK
You can check your answers for this puzzle on Geochecker.com.