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My understanding is that it is possible with Onix, but reserved to that line as a premium feature.

Thanks Bob, glad you found value in it! I welcome any feedback, if you want to pm me anything.

I was able to confirm that the 8 series core units with SI will share with a Sonar/GPS Helix. Pics and video here...
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I haven't seen anything yet, but at the latest, I plan to yank my boat out of storage in the next week or so and I will be anxious to test it out (and report back).

Has anyone been able to successfully pull SI from a core unit to a non-SI Helix unit yet? A number of sources, including Humminbird themselves, have confirmed that this is possible - but I've not...

I'm running the configuration that Brian mentioned in my current boat and it works well - one word of caution: spend the extra time on prepping that shoot-thru hull transducer installation area...