I have a 798CI. Love it. Have learned to spot bait fish on the side image. Very functional with lots of applications. Spot a ball of bait fish 150 ft off the side, move the curser on the screen over to the baitfish and mark spot, switch screen to gps and troll over to the marked spot. There are several websites that feature tips on interpeting side image screens. I'm still learning functions on mine and I am approching 3rd season.

check these sites out for interpitation tips.

http://www.blacklaserlearning.com/in...ask=view&id=38

http://www.instituteformarineacousti...Sonar.htm#Data