i have a cuda 300 on my boat. i will be replacing it shortly.looks to me as pic #1 baitfish,#2 bait ball,#3 fish probably sandies the way they are forming,#4brush with a bait ball on top,#5brush pile,#6 fish, #7bait,#8 fish,#9 floating vegatation or bait. hope this helps. turn you sensativity up and down when you find something on bottom.i usaully run my sensitivity at 90% with the chart speed at max.its not a bad locator for the price but i am fixing to get a down or side scan unit shortly.