947 Humminbird bird fishfinder

SeaArk1 · #1 03-10-2006, 01:44 PM

Put the new 3D Humminbird fish finder on my new boat. Had a problem with it last weekend though. We were putting out some beds for a crappie tournament next month and had some bad readings. We were motoring around trying to find places we were going to put the beds and the monitor says 11FT deep right? WRONG, I just happened to turn around and there we were stirring up mud. Needless to say I wasnt too happy......brand new prop with no new edges anymore. Following the channel in the back of a cove and #'s not jivin with the GPS so we put down the trolling motor to see the differences compared the front unit and back unit. The front fish finder related to GPS perfectly on channel locations and depth changes but the Humminbird on the transom was all over the place. I know it is installed/adjusted wrong as the installer didnt follow the template and the transducer is not straight up and down. This shouldnt cause the problems I am having but still needs to be corrected for correct readings. I havent adjusted it yet to try and get it to read at high MPH because I want it fixed before I go messing with that. The transducer also flips up in the bracket so its reading straight out the back of the boats at speeds over 45 MPH. Has anyone had any experience with any of my problems?? :confused:

Doctor · #2 03-10-2006, 03:50 PM

SeaArk1,

Double check your Humminbird and make sure that you don't have the Lower Range set into manual mode, this would lock your finder in to looking at the same depth, had that happen on my Matrix 67 but the Lowrance was running right beside it so I wasn't worried about the depth just took me a while to figure out that I had engaged the lower range button.

My boat runs near that 45 mph mark it took me sometime to get the transducer adjusted to where it wouldn't flip up when I started trimming up the motor, here's a picture of where I have mine set at and I haven't had any problems with it flipping up except when it smacks something. The bracket that is molded into the top of the transducer is even with the bottom of the boat, I also have it angled a bit more than the Lowrance if you look at the side view, I was using my Lowrance to dial in the Humminbird, some of the humps that I was marking were only partial views so I used the Lowrance to get the correct angle on the Humminbird so that they both read the same.............Doc

Doctor · #3 03-10-2006, 04:33 PM

SeaArk1,

Also doublecheck the tightness of the pivot bolts for the transducer if those get loose then the head will pivot under pressure from the water pushing against it.........Doc

bluecat69 · #4 03-16-2006, 06:52 PM

SeaArk1,
Have you downloaded the latest updates from humminbirds website? I was having simular problems but once I downloaded the updates and installed them I never had a problem again.
Mike

SeaArk1 · #5 03-17-2006, 02:16 PM

No I havent.....exactly how do you do that?

I am heading over to their website now to take a look

THANKS