U-Tube shortens the Learning Curve -- I am Installing my Helix 7 with the Upgrade to the HD transducer that gives a better Picture of the Bottom and Fish that you get with the Helix 10 or 12 --- I found this out on CDC -- You return the supplied transducer and mounting hardware unopened and swap for the XHS - HDSI 180T Cost $85 --- The upgrade without exchange is $169... Happy fishing