*2d shows a "cartoon like" image of stuff under the boat...
*DI shows a "picture like" image of stuff under the boat...and out to the sides a few feet...
*SI shows a "picture like" image of stuff under the boat, out to the sides 100+ ft...and which side of the boat...


SI advantage is finding structure....(even far out to the sides of the boat)...

Then re-position the boat to effectly fish that "new-found structure" with the DI or the 2d...


Rickie