DI vs 2d is a very opinionated discussion with these units.....

Some find DI as a replacement for 2d.....

Some find DI as an additional tool along with 2d...

Learn to understand the shape of the different sonar beam here...http://www.crappie.com/crappie/fishi...am-shapes.html ...

Use the info in how to best utilize that sonar beam shape for the type of fishing that you do....remembering that it doesn't matter if that object is under your boat...if that object is not in that sonar beam shape..it's not going to show on your screen....

Also remember that the DI image in the 1100, 900, 800, 700 series units is derived from the SI crystals in the xducer...(they do not have dedicated DI crystals like the newer 500 series DI units)....

Myself..in my 1197...I do not use the DI but very little....I feel the 2d is more sensitive to picking up the weaker returns....because of the lack of dedicated DI crystals in the xducer...

So, to answer your question...

I first search for wp's using split screen SI/ Chart.....

Then once I see the brush on my SI.....

I use the 2d/Chart to "refind' my WP's ......and for the following two reasons....
1. The cone shape of the 2d will pick up the brushpile in front of my boat before my boat gets to it...(The DI will only pick it up when the boat is actually on top of or to the side of the brush)
2. I feel the DI sensitivity in my 1197 is not as good at picking up weaker returns than 2d (because my 1197 doesn't have the dedicated crystals in the xducer)....

Rickie