Most settings work well at default with the following tweaks ...:
*DI or SI imaging = match Chart speed to boat ...
*DI or SI imaging Sensitivity = adjust often to brighten/darken the image ...
*SI Range = shorter for general use 60-70ft - even shorter to distinguish targets ...
*DI or SI palette = brighter palettes for sunny days/ darker palettes for cloudy days ...
*2d Chart speed = higher unless using split 2d with DI or SI - then match Chart speed to boat speed ...
*DI or SI frequency = higher frequency for more detail with less range - lower frequency for more range with less detail ...
Rickie