The 950 coil on the V3I and it did not work any better than the DD10 coil. I'm still trying to figure how to use this coil on salt water beaches -- any coil. Cannot get the machine to quiet down. Good on dry sand but get near wet or near the water acts like it is under a power line. Tried lowering and raising RF gain, all metal and discrimination. Tried all single frequencies, filters and offsets in salt subtract and different programs. It still operates like you are sitting under high tension lines. Is this machine made to work next to salt water? Great machine on dry land. Should I look for a straight water machine?