Looked it up for you.
http://old.charlestonfishing.com/forum/topic.asp?TOPIC_ID=74455
Tons of good info in the entire thread. Myself, I copied all the important details and printed them into a guide. I carried it around in my planner at work and would pour over the stuff again and again during coffee breaks and lunches until it sank in. Next I took the boat to the lake and practiced using what I had learned. When I got familiar with how to adjust the sonar I hit some of the live bottom areas and practiced again. IT WORKS!!!
Good Luck