See page 3 on the 2012 "SEARCHER"
http://www.garrett.com/hobbysite/searcher_pdf/3500055_searcher_summer_2012_inter.pdf
http://www.garrett.com/hobbysite/searcher_pdf/3500055_searcher_summer_2012_inter.pdf
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John-Edmonton said:It goes something like this.....
[size=x-large]To make your detector more sensitive to high conductors (silver, copper) lower the VDI numbers. To make your metal detector more sensitive to low conductors (gold, iron) raise the VDI numbers.[/size]
Now for the AT Series, instead of raising/lowering 10-20 points at a time, try increments of 5 at a time.