I have Humminbird HD Di mounted on my trolling motor. I single pole and push minnows...I have found it quite useless for either of these styles of fishing, because with Di you get a razor thin image from straight below the transducer(trolling motor). What you see on the screen is all ready past where you are fishing. Humminbird has a very good 2d sonar on the Di, called Switchfire, which will let me see just past the tips of my rods in 14-20fow.
If it's to deep to stand up and there is to much to drink, WEAR YOUR LIFE JACKET.