Was that at the beach this morning and just didn't seem to be finding many targets. I did find a quarter maybe 3 in deep and decided to do some testing with it. I went up to the dry sand where there aren't large concentrations of black sand, like down at the water. I dug a hole about 8in deep and placed the quarter flat in the bottom of the hole and reburied it. Any settings less than 10 on the ground and 10 on the sensitivity would produce mid tone or iron tone only. If I backed either knob down another notch or two all signal was lost. It just doesn't seem like there's any room for fine-tuning, if I don't run the machine totally maxed out I won't find anything deeper than 5 in, but it barely falses at those settings. I don't know, it just doesn't seem right. It just seems counterintuitive that I would be able to run it maxed out and get very little falsing. every machine I have ever owned, including a CZ 20 years ago, would false like crazy running maxed out. Also, I am able to ground balance the machine at home in my yard but not at the beach anywhere I have tried. even with the ground knob maxed out at 10 I am pushing sound into the ground as the coil approaches about the 4in from the ground mark. If I get the coil closer to an inch from the ground it pretty much squeals like I'm over iron when there is none there. It's the same with the pinpoint method as well, the closer you get to the ground the louder it gets even though I'm not over iron. any help from experience CZ 20 or 21 users would surely be appreciated.