Concur with #1 and #2 but the directions and photo is wrong for #3 and #4. The long angled side is forward no matter which side you mount it on. I called (and held for 64 minutes) to speak to a technician when I first mounted the transducer and he admitted the manual had it wrong. The smaller steps of the transducer is the rear of the transducer.
Now, saying all that, it also does not appear to matter according to tech support as the transducer apparently learns what direction you are going and will adjust. Go figure that one out. I hope this makes sense as I wrestled with this for a solid month before finally breaking down and calling tech support.
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