Fisher-o-Men ... if you haven't already done so, you might want to take a look at the sticky thread on the E5DSI that I started. It's a long, involved read, but contains a lot of good info that may help you get the most out of your new unit. Especially helpful are the charts explaining how the sonar scan is laid out & different from 2d sonar cones, and the various links to the Operations Manual & update page, etc.

... cp