i crappie fish several times a week in local farm reservoirs. it is rare that i fish water deeper than 12 to 15 feet. i prefer hummingbird electronics. don't know the model name/number but it cost about 235.00 from wmt. all i care about is the depth and bottom contour. i look for stumps, tree limbs, etc., anyplace crappie are staging. the newer, panographic units look to be good stuff, but don't appeal to me. i could get by fine with a 99.00 unit, as long as i can see the bottom and some structure. i was fishing the other day and a fellow trolled over to me. he said he had 2700.00 worth of electronics on his boat and was trying to learn how to use it. i couldn't help him. good luck with whichever unit you select.