Now the DI and 2d...

In the HB "DI from SI" (like your SI series Unit)..I don't use DI very often but when I do...I use the Wide setting on the DI to cover a wider area of bottom....

2d...I use the 83/200 blended setting to cover more bottom with the 83kHz sonar cone (the 83 is a 60° cone) "and" get the better detail of the 200kHz sonar cone (the 200 is a 20° cone)...

I use "Switchfire On" for water deeper than 10 ft...and adjust the Sensitivity to an acceptable clutter level...
I turn "Switchfire Off" for water shallower than 10 ft....and adjust the Sensitivity to an acceptable clutter level...

(Switchfire On will really make the brush "pop" out on the screen, but it also shows clutter very readily which can make the image hard to distinguish at times...)

Rickie