Greetings,
Since new, I've been struggling with my 899CI HD SI. At one point Hummingbird was nice enough to send a replacement transducer which did not resolve the issue. Last month I sent the entire unit and transducer in for service which was returned with a clean bill of health. Based on the images below which were taken with factory default settings, what do you suppose could be the cause of the erratic display (I'm not ruling out user error)? The boat in question has no trolling motor or other electronics and the main engine is off.
I should also add that SI has never produced detailed images.
Any and all input will be greatly appreciated!