I've used the Tracker in competition hunts with good success. I was hunting at my usual clip and noticed the nickels and some deeper coins either left a "scratch" sound in the speaker or a "click". I started hunting at a casual pace as the area was mineralized and the coin ratio shot up dramatically. The scratch sound on nickels now became more of a "zip"-which I was more likely to investigate- and the clicks would give a short, quick high tone. I think most of it has to do with the quick response of the Tracker and maybe the time needed to adjust to mineralization-but the difference is quite noticeable. Hope this helps. I will save the fast sweeps for competition hunts.