I don't use the crosshairs but prefer digital in conjunction with tones. For the crosshairs to be of much value there has to be some kind of averaging so they don't jump all over the place on hits. That causes them to lag the tones and digital reading from what I see. I kind of marked crosshairs off way back and go with digital and tones.
What I have found with digital and tones is there are places where fill dirt has been used to landscape, as an example, and where the original soil and fill soil meet there can be an area where the minerals are very different. It is almost as if there is a line drawn in the soil and at that point there is a high tone. However, it is mostly a problem if using manual sensitivity and it is set real high. In semi-auto we will pass over that area and hardly notice the change. If we go to pinpoint there is a noticeable difference in the soils at this point. I have never found anything other than just soil. I am not sure why we get a high tone other than tones are based on the time constant. The longest TC would be the highest pitch tone and the shortest TC the lowest pitch tone.
Other than that I have no answer for the crosshairs locked at 30/30 with a high pitch tone in ferrous.
What I have found with digital and tones is there are places where fill dirt has been used to landscape, as an example, and where the original soil and fill soil meet there can be an area where the minerals are very different. It is almost as if there is a line drawn in the soil and at that point there is a high tone. However, it is mostly a problem if using manual sensitivity and it is set real high. In semi-auto we will pass over that area and hardly notice the change. If we go to pinpoint there is a noticeable difference in the soils at this point. I have never found anything other than just soil. I am not sure why we get a high tone other than tones are based on the time constant. The longest TC would be the highest pitch tone and the shortest TC the lowest pitch tone.
Other than that I have no answer for the crosshairs locked at 30/30 with a high pitch tone in ferrous.