Actually no Art. I recommend an out right air-test. Away from any type of interference. some kind of picnic table or something steady non conductive outdoors. Also use some type of stick taped to the coil rod for reference this way there is no guessing on if there is any loss of depth or not. Make that mark on the rod at max sens, sweeping a coin back and fourth, then start backing off[use your head phones].........the machine will show you the way. I have owned four different Sov machines, the loss of depth usually happens around the 10 O'Clock area. But can vary. In the air is the purest way, nothing to taint the results. After you set it don't worry what type of ground you put it in or ocean, it will not make any difference. Do not forget to turn back slightly when you find that depth loss area. Maybe around 1/16 of an inch to 1/8 [not much]. I do not know why but when you set up the machine like this is just seems to Purr. I hunted today for about 3hrs. I dug so many targets, i have had ice on my shoulder twice. I also was following my friend today with his Whites, PI yes it is a deep machine, but lets just say he missed a few. One thing i want to add, with the machine set up this way, I cannot tell you the amount of just the faintest ticks i have heard. In the beginning I used to test every one by cranking up the sens to max..........I have never ONCE heard a target get louder or stronger.........I must have tried 100 targets this way, now I don't even bother. hope this helps........
HH Dave