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Message: <blockquote data-quote="Still Afloat" data-source="post: 507439" data-attributes="member: 32426">If you get the SI head unit it will also do DI but, the DI unit won’t do SI. Also on the Helix 7 G3N  you can not remotely display SI on a Helix 7 DI head unit. So spend the extra coin on the SI and get the network option.  It will give you more flexibility down the road.As far as the preference, they both have advantages for imaging structure.  I think the SI helps you interpret the DI images. I’ll run both in split screen with the two SI images on top and the DI in the lower 25 to 30% of the screen.</blockquote>