Fish finder plotter advice

[teamsam]

13 hours ago, Dutch said:

You said you had a 9 then you say 8;  Which is it?  Which Gen I II III?  That makes a difference in how you can set things up.  Like Sore Thumbs said you have to get an hds in order to network wpts.  In my opinion that is the most critical thing you can do if you mark any spots then fish them later.  If you can fit it into your budget a Point 1 antenna and an NMEA 2000 network are great additions.

For a novice, what does the Point 1 antenna and NMEA 2000 network do for you?