I have a 17ft aluminum Starcraft, basically the same set up as a Tracker but has 2 livewells. I realized that when I have 2 or more people in the boat I have to lower the transducer figured this out this weekend when I lost the bottom once I hit about 17 MPH. I just updated the software so my initial thoughts were it was the software but once I lowered the transducer a little no issues and I got fish arches again not lines.