I have a HDS 7 that replaced a Lowrance X510c. Kept the same transducers and power cord. If i install Structurescan do i need to buy a power cord or will the power cord that comes with the Structurescan be all that I need? Should I purchase Structurescan 1 or 2. When using this unit on fish arches I have a hard time seeing any thing on the screen. I am in shallow water. Is my ping speed to high, my sensitiventy not high enough. Could be that it is just ME!!!!! Maybe I don't know how to interpret what I am seeing. The bottom, alarms an other readings seems to work fine so I don;t suspect transducer problems Seems like every time I use this sonar I learn something new. Any comments are appreciated Thanks to the best forum on the web. You guys are the best.