Put the new 3D Humminbird fish finder on my new boat. Had a problem with it last weekend though. We were putting out some beds for a crappie tournament next month and had some bad readings. We were motoring around trying to find places we were going to put the beds and the monitor says 11FT deep right? WRONG, I just happened to turn around and there we were stirring up mud. Needless to say I wasnt too happy......brand new prop with no new edges anymore. Following the channel in the back of a cove and #'s not jivin with the GPS so we put down the trolling motor to see the differences compared the front unit and back unit. The front fish finder related to GPS perfectly on channel locations and depth changes but the Humminbird on the transom was all over the place. I know it is installed/adjusted wrong as the installer didnt follow the template and the transducer is not straight up and down. This shouldnt cause the problems I am having but still needs to be corrected for correct readings. I havent adjusted it yet to try and get it to read at high MPH because I want it fixed before I go messing with that. The transducer also flips up in the bracket so its reading straight out the back of the boats at speeds over 45 MPH. Has anyone had any experience with any of my problems??