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Message: <blockquote data-quote="Still Afloat" data-source="post: 498663" data-attributes="member: 32426">Thanks for the reply Fuzzygrub. That’s a good point on possible ventilation when mounting the transducer close to the outboard.  This boat is already a bit picky about the prop slipping.  When I picked up a new prop last year the prop shop had to add extra cupping.  This boat has an 97’ Evenrude 115 and I think the previous owner set up the motor as high as possible since he was primarily fishing a Montana river.I’ve considered the frequencies of the Helix 7 SI, DI and sonar.  The Helix 7 DI unit was set to 2D sonar which uses a much lower frequency.  I could be wrong, but I don’t think the Helix is frequency selective based on the viewing mode (DI/2D).  In other words, I think it just blasts away at both DI and sonar frequencies all of the time.  Perhaps the Helix 7 can be fooled by selecting a 2D sonar transducer in set-up.  Otherwise, I could approach this from hardware and use a transducer that isn’t capable of the higher SI/DI frequencies.  I have an older HB tranducer that might do the trick.  Need to look up the specs on it.I’m probably over thinking this but, I want to exhaust possibilities before swapping hardware or drilling more holes in hull.</blockquote>