In 1984 I got out of my car for my first hunt ever and put my coil right down on a 3 inch deep Standing Liberty Quarter, first dig ever. that was 1984, haven't found another one since...been "all excited for nothing" plenty of times after that!
Sometimes it's good just to be excited, because you never know what's coming out of the ground next! Just be careful of the signals that jump around, I use Garretts as well and that usually means junk, I still think you should dig up the jumpers, just don't get too excited, ha ha!