i have one . i don`t jig fish that much . got it some years ago and i don`t take it all the time becouse my boat is crowde. i now have a pontoon and will use it more . i read articles on them . if you know the depth that the crappie are holding then you use it at that depth . remember that the transducer is under the water a couple of ft.
red a artickle in a magazine wher a fisher man tried it and didn`t work . when he herd a fisherman talking about the fish he cought at a certan depth . he tried it at that depth and it worked . just another fishing toy :D
retired and now i will always fish