Still trying to learn to use new HDS 7, Fish icons awful small. Every thing I read says use fish arches, including Lowrance tech support. Isn't it hard when the boat is moving slowly to know you are on fish. Statements made about fish icons being interference,air bubbles, etc.and more detail and information using fish arches . This is a whole new world for me. You guys that use the arches ,did it take you a long time to learn this method..... Thanks to the guys that know and are willing to share knowledge, great web site.