Here you join the hunt for the elusive wild opencache. Often while in the woods you can here the call of one creature to another. A method often used by hunters is to duplicate the calls of their prey.
The opencache is a secretive creature but is easily aroused from it's slumber when it hears the call of another. The coordinates will place you near a known opencache lair. Here you should call to the opencache then remain silent in order to track it. A sharp tone is most likely to elicit a response from any nearby opencaches. If at first you hear no response, take a few steps away and call again.
Since they too have a visual component to their response a night hunt may also be possible.