I’m not as familiar with the Simrad Menu system ...
Is there an SI Chart Speed or Scroll Speed Menu selection that you can find ... ?
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SI can be imagined as an MRI taking slice photos of the underwater world - and then software “stitching” those slice photos back together in the displayed SI image ...
*If the boat speed is faster than the unit captures those slice photos - targets will be compressed in the SI image ...
*If the boat speed is slower than the unit captures those slice photos - targets will be stretched in the SI image ...
Some brands offer a “Chart Speed” or “Scroll Speed” setting to adjust for different boat speeds during SI imaging to “match boat speed to Chart Speed” ...
If Simrad does not offer this setting - experiment with SI scanning at slower boat speeds and faster boat speeds to get the “slice photos” stitched (in the software) an optimum rate compared to the boat speed ...
Rickie