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Mounting any xducer directly to the side of a SI xducer can partially block the SI beam on the obstruction side ...
This scenario is more pertinent if the SI xducer is HB (HB SI beam reaches all the way to the water's surface above horizontal from the SI xducer housing) ...
This can be avoided by mounting the 2nd xducer a little higher than the SI xducer ... or 1 xducer in front of the other ...
Rickie
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I would put the Helix 12 on the dash reason being if I am at the helm I am in search mode and I want my best Depth finder in that location to find areas to fish. Once on structure the 999 will be more then enough for fishing vertical.
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