If you are fishing a body of water, other than a river, this information will help you in the spring time. You don't even need a fish finder (sonar). Check the back of coves or bays and look for the goslings and ducklings. The big cats (both Ark. Blues and flatheads) will be in close proximity. Every spring my partner and myself have certain coves that we work because of the small ducks and geese and we are always rewarded with a fish in the high twenties to thirties. Also, check out the banks of the coves for mussel shells. The cats have rooted them up while feeding and the racoons, musrats and river otters are feeding on those that float up. You can drift fish (using your trolling motor or you can anchor down), I have had good luck doing both. Check it out and let me know if this technique works in your area.