Simple, I use it to locate structure...weed lines, grass, etc off shore. Lakes I fish around here are usually less than 10-12 feet deep. So depending on crappie season I am either interested in accurate depth contour lines or some type of structure out in the middle of the salad bowl.

So with the shallow depths, I would have to set the range very low to expand the water column on the screen to look for fish and that would defeat the purpose of si for me.