Gary,.... thanks for the tip on IDing the steel bottle caps, that will come in handy....Wally,....You'll love your Gold Bug DP. I've had one a few months and I like it a lot. I picked up the extra 5" coil for it too. Use that more than the 11". I think I lose about 1" depth with it, but it's really good for working the trash and getting in between stuff. Get use to digging lots of small stuff, it's very sensitive to small objects. So you'll dig small lead shot and little screws, but that means it will pick up small pieces of necklaces and gold chain!. I found a small silver chain yesterday. It still amazes me how loud it will sound off on a six inch deep target, and when I dig the hole and I'm about to give up, I find a little clasp or a 1/4" piece of wire.....I've had Zero problems with EMI. Sometimes it will chatter a little on 100% sensitivity, but that is when there is just too big a piece of metal in the ground and the machine is just overloading on it. My Garret PP is not a problem as long as I keep it 1 foot from the coil. But my shovel is a problem if I get 1 foot from the coil, too!. My cell phone I always leave in the car. Remember, these machines have Dual Processors so they are carrying on a lot of functions FAST. Like discriminating targets and recovering in a split second. No programming to deal with, just set the machine and hunt. I typically set it at 50 in discrimination. Nickel targets and up are high sound, down to 35-40 is low sound, Iron is quiet ......If you want to have some fun get yourself a sand scoop or a small hand shovel and hit the playground, volley ball, tot lots. You can go through them fast digging sand and the Goldbug DP/Pro's are sensitive on small jewelry. Sometimes I think they respond better in the Gold range than they do in the Silver range. Very good on the relic targets. I here they ground balance right down to wet salt, but don't have any of that here. These are good machines, if you aren't finding anything with one of these,.. it's not the machine.... Happy Hunting....Cleetus