You'll find lots of interesting discussion, charts, graphs, pics, screenshots, etc in this thread : http://www.crappie.com/crappie/fishi...-chartplotter/

I believe this is the thread that MJohnson is referring to.

But, to keep you from having to plow through 83 pages in my thread, just to find the chart or link showing the shapes of the different sonar spreads, here's a link that shows them : newDIbeams.png Photo by kosmo012 | Photobucket

Now, that's not to say that there isn't plenty of good info contained in that thread, that may be of even more benefit in learning how various units work and why they show what they show. And even though this thread was specific to the Elite 5DSI unit that I have, some of the information can be transferred to the same components of other units.

... cp