they make something called a depth of troll, not sure who makes it or where to get one, but ive heard of them. they look at the angle your entering the water at, and the length of line out, and give a good estimate. the best thing to do is get a depth finder, and try to guess where your at, then when you go by the shallows, youll know how deep you are if you touch or not. I think with 1 oz banana weight we were down just under a foot per pull last weekend. The other thing is, dont go too fast, kokes like the speed around .8 to 1.4 or so, and if your trolling to fast, your gear will not be as deep. just keep trying, youll get it, Brian