I have this exact same unit. It might seem a bit daunting at first, but it's not overly complicated once its setup.
Have you tried watching a few youtube videos?
eg: This 5 part Series:
https://www.youtube.com/watch?v=qI7XwUXGrDA&list=PLDOpC-IhUxYO1Qs6rD4z-EKT9M_cS4IRF&index=2
More settings:
https://www.youtube.com/watch?v=ZC1MS9s2WSk
Grab a pen & paper, a beer, and get through these. If you've still got any questions afterwards, let us know. Otherwise I've called the Lowrance technical support number before with a question and they were great too.