I fished 13 hrs yesterday and spent as much time on electronics as I did fishing. I marked fish all day on piers and bridge pilings that would not bite. Soooo I got out my marker and headed for deeper water and started playing with the electronics. I idled at 3 MPH with the SI on until I marked fish on structure in 25 ft of water. I tossed the marker and made another pass with DI to reference where the marker actually landed and where the fish were located. I then set the I pilot about 20 foot off the marker and turned the 360 on to watch them school around. I picked up 10-15 fish in an hour. This method will be repeated this afternoon.