Humminbird Side Imaging Forums
Side Imaging Forums => 997c SI, 998c SI & 999ci HD SI => Topic started by: Bill H on January 27, 2014, 11:40:06 AM
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I just installed this unit 2 days ago and the Side Imaging and DI / 2D sonar all work great. But when I get on plane with the boat, the DI and 2D sonar screens have clutter, and both are pretty much useless, it still registers depth etc but screens are not readable. The 2D is in clear mode. Is this normal or maybe just need to adjust the transducer?
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normal for the transom transducer. If you have a fiberglass boat, then you can get a shoot-thru transducer with a splitter cable and that might help you with on-plane readings but I don't know how well of a reading you want at WOT.
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Thanks for the information.
I am new to this new style of unit, I guess I thought the 2D sonar would be like my cheapo unit that came with the boat. I have an aluminum Tracker Targa V18 WT Deep V boat. I am not really looking for detail as much at WOT but thought bottom contour might be visible in 2D or DI mode.
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You cannot shoot through the hull on an aluminum boat.
You will need to put a standard 2D transducer on the transom and connect it with the SI ducer with a y-cable adapter.
With this setup the SI & DI signals will come from the SI ducer and the 2D signals will come from the 2D one. On the Sonar Menu Tab under Transducer Select you would still select the HI-Def Sidescan. The 2D signal will come from the 2D ducer do to the wiring changes made by the y-cable adapter.
This will give you the ability to get the best possible 2D readings at speed for your setup.
A lot of guys run this setup with SI units.
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The two parts I would need is the AS SIDB Y and the XNT 9 20?
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You are correct that's exactly what you will need.
The y-cable adapter will plug directly into the graph and the SI & 2D ducers will plug into the adapter.
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The HDSi transducer you have with your 998 unit is capable of high-speed depth readings just like any other 2D transducer. The trick to this is in having a boat hull that will allow this larger transducer to be mounted in a location that will allow it to happen. Aluminum boats are notorious for having highs-peed depth reading problems. I would recommend looking at either the XNT-9-20 + AS-Si-DB-Y set-up or possibly the AirMar AlumaDucer. It may be that you can adjust your HDSi transducer to work at higher boat speeds but doing so will expose it to more potential damage from floating debris and stumps/rocks.