the new graph i bought- Humminbird 987Si is OUT OF THIS WORLD!! the images and capabilities it has is defiantely NEW technology. I could spend all day just loooking at the lake bed... It showed me stumps fields, gravel beds, ditches, ledges, roadbeds, rocks, trees. creek channels.... I wouldnt hesitate to put one on an offshore boat ifn I had one. even the 2d (regular straight down) sonar is very accurate. I can now drive by a marina and see what is under the boat slips.....or across a point and find everyone elses brushpiles... I cant wait to go to Lake Benbrook with it.