I'm looking at buying a hds 5 gen1 lss 1 setup with 2 head units, transducers and all wiring. Can someone please explain what is the difference in having the structure scan? I saw it on my brother's boat and liked it but not sure what would be better. I Been looking and reading about Garmin, hummingbird and lowrance units but have not been able to find were it explains it. Also I read that down image will only work above 2 mph and side scan will work at 0.1 mph. Is this true and what are opinions on the structure scan vs other units?

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