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 Through Hull 
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Joined: Tue Jul 06, 2010 9:54 am
Posts: 7
Looking for pro and con in installing a transducer to shoot through the hull. I am installing a 898 SI and will interlink with a 797 Si on trolling motor also have 898 installed on transom for side image. Will the down image be greatly reduced by through the hull and is it hard to switch from SI to down image with this setup?
Any information about what works and what does not work is needed.

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Tue Aug 24, 2010 8:44 pm
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Joined: Tue Feb 17, 2009 4:02 pm
Posts: 571
Location: Alabama
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I going out on a limb here but I would imagine there will be no down image si if that whats you mean by down image. Only traditional sonar works on through hull. The DI relies on the SI, not the traditional down sonar

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Wed Aug 25, 2010 10:26 am
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Joined: Tue Apr 17, 2007 6:26 pm
Posts: 4304
Location: Eufaula, AL.
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That’s a good strong limb that you are on there Whompus. We’ve tested installing the Si transducer inside-the-hull and it did not give good results at all. Lots of signal loss as well as other problems. So I’m like you and think that there would be little to no Di (Down Imaging) sonar if this was done. Now the conventional downwards points “2D” sonar will work just fine. With a good installation I doubt that you would notice any signal loss (although there will be).

Now if you were asking about installing a 2D transducer inside-the-hull (like the XP-9-20) than I would recommend that you get the AS-Si-DB-Y cable as this will connect up both the 2D and HDSi transducers to the 898 unit. The Si and water temp would come from the HDSi transducer and the 2D sonar would always come from the inside-the-hull DualBeam XP-9-20 transducer – no switching involved here.

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Wed Aug 25, 2010 12:42 pm
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Joined: Tue Jul 06, 2010 9:54 am
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Thank you for the great information. Will stay with the transom mount only.

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Wed Aug 25, 2010 10:14 pm
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Joined: Tue Feb 17, 2009 4:02 pm
Posts: 571
Location: Alabama
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Sidenote: I have SI on my trolling motor and it works great if you keep in mind the movement of the trolling motor due to turning. Love SI on trolling motor

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Thu Aug 26, 2010 9:29 am
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Joined: Thu Apr 01, 2010 8:13 pm
Posts: 5
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i am trying this on my skiff,waiting on the big brown truck to bring it...

http://store.humminbird.com/products/313999/XFM_9_20


i will try to remember to update..


i have tried mounting the transom mount everywhere on my Carolina Skiff DLV,it just will not work at speed,works great idling or slow trolling.. :(


Sun Sep 26, 2010 11:15 am
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Joined: Tue Jul 06, 2010 9:54 am
Posts: 7
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I bought one that installs through the hull. It is installedin a Nitro 750, it is near the transom. BP installed it and said they set it over so it will not disrupt the water flow toward the motor.

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Sat Oct 16, 2010 1:11 pm
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Joined: Tue Apr 17, 2007 6:26 pm
Posts: 4304
Location: Eufaula, AL.
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cchunter22,
Is this an inside-the-hull transducer or one that actually mounts through a hole in the hull?

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Greg Walters at Humminbird
gwalters@johnsonoutdoors.com
I help because I can


Tue Oct 19, 2010 9:46 am
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