As you are a Lowrance user, there is a Man that has classes, has dvds out that takes you from beginner to advanced user. "The Professor" Wilson Frazier. I have all four of his DVDs, have been to one of his classes. He knows his stuff. But I am a Humminbird user and they are different as night and day. I am not going to debate as to how is better, just look into his DVDs. I did learn a lot on GPS and the basics of sonar interpretation. You could also look for Lowrance boards like the Humminbird board. One heck of a lot of info flows on ours.