I HAVE A GARRETT AT PRO ALSO! MY FAVORITE MODE IS PRO/ COIN ( ITS A GREAT WAY TO FILTER THROUGH THE BOG IRON AND GET RIGHT TO THE GOOD STUFF ) SINCE YOUR DETECTOR IS WATERPROOF UP TO TEN FT YOU SHOULD ALSO PICK UP THE AMPHIBIOUS HEADPHONES WHEN ABLE!
ALSO PICK UP A PINPOINTER IF YOU HAVE DONE ONE ALREADY! THEY HAVE WATERPROOF OR NON WATER PROOF , BUT IF YOUR CHEAP LIKE ME YOU CAN CHECK OUT WHAT I DID TO WATER PROOF MY OWN.