You don't need a graph to spider rig. I first for a year before I bought one. Warning once the spider bites. Its over! You will eventually buy one along with a much of other stuff. Anyway use a stick your rod or something to find out how deep the water is. Put your far left rod at 2ft. Next rod at 4ft. And so on till you catch one. Then 2 at that depth and 2 1ft. Up and 1 1ft lower. Then the fish will tell you what you need to know. The hardest part about learning to spider rig is learning to fish the things you cant see and not the things you can. Now get out in the middle and drown some minnows!