I'm not sure if anyone has done one like this before, so I'll go ahead and at least say that *I* have never done one like this before.
Anyway, here's a limerick that will lead you to the puzzle:
Headed out to where the geocache is
Only to have your hopes succumb to smashes
Pull out your handy radio
Enter four zero zero and go
You just need to follow the dots and dashes!
Congrats to vorriecj80 on a quick FTF!
You can validate your puzzle solution with certitude.