What version software are you running?

At the moment the 1.83 I think? I personally did the 1.84 before I shipped it off and it came back with the 1.83. The new 1.9 is out as of 02-06-2019 and who I talked to at Humminbird said it would have all new software in it and all I have to do is hook it up and go...

I had a erratic depth reading on my old Hummingbird 898c.Checked everything I knew to check. Finally discovered by accident that if there was a little water down around the bilge pump the depth reading would work flawlessly. I started pouring a regularly bottle of water down by the bilge. I've never had anymore problem.. I believe that there is slightly loose transducer or a slight crack in the epoxy between the transducer and hull. The transducer won't penetrate air but it will go through epoxy and fiberglass. The water fills the empty space so it works. It's kinda crazy but it works. Untill I replace it.

My experience with HB was a PITA until I got in touch with one person. Let me see if I can find her name and contact info.