Altough Raymarine is good unit , I think it is not enogh. It has some poor features like Screen and GPS . I put the Lowrance Elite 7X in my boat in a weekend. Quick and easy.Install Instructions were very easy to follow and I couldn't wait to get the boat out to give it a test run. I didn't take any fishing poles so I could get to know the fishfinder. I was amazed at the detail of the down imaging. I highly recommend it. I found it on http://www.fishfinderguy.com/ .It was great choice for me.