I picked up a LMS-520c for the console (side of dash not in the dash) I was flipping through the manual for the instal and it showed the wiring diagrams but I am a little unsure on what is going on.  It has a connector going to the unit with three wires coming out of it.  It shows the NMEA 2000 Power cable being ran to the battery with an inline fuse and a mandatory network power off switch.  Is that Power off switch something I have to buy and add?  The second wire is a Display Unit power Cable with an inline fuse going to the batter and this wire says Recommended display power-off switch.  What is the switch for?  Seems like there are alot of additional switches to add.  The third wire says Data Cable and it dosn't show it going to anything do those four little wires just get capped off.  Right now I am only running one Lowrance graph and the GPS puck not trying to hook two units up.  Just want to make sure I am all clear on this before I take the time to epoxy the transducer in the boat and run all wires then find out I missed something.  Some ideas, pictures or drawings  will help.  Thanks.

I just put a 332c in my boat so I may be able to help. First the unit has to be powered. I've got a main power switch on my dash that sends 12v to the fuse block for all the pumps, electronics, ect. I attached the provided fuse to the unit hot wire and attached it to this switched 12v's. The ground and shield wires tie together and go to a ground strip also on the fuse block. Second, the NEMA cable has to be powered also. I attached it the same way as before being sure to use the provided fuse. This provides power only when the switch is on so the battery won't go dead without adding any switches. The four little data wires are not used.  Once this is done the antenna can be connected to the unit being sure to use the T with the 60ohm termination on one leg. big

What epoxy did you use to mount your transducer?  If you did it that way?

Mine's a Triton aluminum so it had to be transom mounted.