We run 2oz'ers six foot up from the harness or spoon, then vary depths in five foot increments starting at 25-30-35-40-45-50 and see where we are picking up the fish. You can use the chart, but there are so many variables depending on current, which way the waves and wind are blowing, what line you are using, trolling speed, etc, we just use the shotgun approach instead of trying to be too specific.