I have an 04 just like your 05, same DF/FF, same problem, I adjusted the ducer a couple times, but never got any thing different, and I don't worry about it. I run the main channel when not in familar water and go slow when I'm not in the main channel. The 37 is not that great of a DF, not a terrible, but not high $$ either. Mine works good for me as I don't have any nicks/scratches/chunks missing from the prop or skeg as of today, but subject to change the next time I go. I will guess you have to move the ducer to another position on the transom to get an accurate reading at speed as the ducer is probably in turbulent water at speed on this boat.


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