Back in the early 70's many people were in too much of a hurry, they only to dug all the shallow silver (2 to 5 inches deep), plus some machines had to be whipped like you were cutting weeds with a man-powered weed whacker to get a signal. Most all, except I think the Fisher 550-D were high frequency machines. Those worked really well in moist soil. Now with all machines being virtually low freq. machines, people are just in too much of a hurry, they don't have much time to hunt. Even back in the 80's, we were telling everyone to SLOW DOWN, few listened, most did not. I started out with a Radio Shack BFO, only good to 2 inches, and what wild sounds ya got from that lil booger. I have been hunting since 1960 - 61. Believe me , I know what slow is..........now. Yes, it is good to slow down to a snail's pace, use no discrimination, listen to the sounds, then look at the screen, but, Dig it anyways! That's how you learn your machine. I have a small area in one of my favorite parks that I take all my "new" additions to my arsenal to. It is only about 50' X 50'. You should see the stuff I keep pulling from that area. I have cleaned every rusted bottlecap, pulltab, screwcaps, nails, thumbtack nails, beer cap foils, using a 5 second sweep speed. But, when I slowed down to a 15 to 20 second sweep, I have pulled indian cents, indian nickels, 2 Barber dimes, 3 silver rings, 1 gold ring, and a few more old wheats from this spot. Just waiting for the weather to warm a bit more, and the ground to thaw, then it's back to my favorite spot to see what the extremely deep frost has heaved up this year.........nge