I have done some searches on here and not able to find a quick answer. For those of you that have compared different water detectors, i would like to hear your comparisons on which one in your opinion is deeper. the SS PI strangely only seems to get about six to eight inches and comes off weak on identifying targets. in your opinion what are your three top water machine's for salt water beach hunting both wet and dry sand with the exception of diving on east coast beaches, VLF or pi? thanks for your help