Just looked it up. It does have NMEA 2000 and 0183 - 2000 being current technology.
To get full sharing of all info between units, you would have to go with HDS (connected by Ethernet). HDS also has NMEA 2000 and 0183.
Gen1 non-touch units will share sonar/SS and waypoints. Gen2 non-touch units will share same as Gen1 plus update V2.0 shares map chip info (only need 1 chip for all units connected). Both these require an added box plus SS ducer for DI/SI.
Gen2 Touch does what the Gen2 non-touch does except by touch-screen. It also doesn't require the separate SS Module - the SS ducer connects directly to unit.
Gen3 Touch does what Gen2 Touch does. A small set of function buttons was also added back onto the face of the unit. It also has wireless connectivity for updates and I don't know what else.
Carbon (Gen4 Touch effectively) does everything Gen 3 does. Also has dual processers and a bunch of stuff that I can't keep track of 'cause there's no way I'm paying for one of those, almost what I paid for my boat.
Of course, the farther back in the generations you go, the cheaper you can get stuff. Fair warning though, Lowrance will not support any of its units older than Gen3 at this point. Once the unit is out of warranty, they won't fix it - whether or not you're willing to pay them to do so. For that matter, sometimes they won't fix it when its under warranty either replace with another or will "upgrade" you to the next newer (for a price). I think its a crappy way of conducting business but that's another topic we'll avoid here...just something you should be aware of.
I run (non-touch) (2) Gen2 HDS 8s at helm and (1) Gen2 HDS 10 at bow and I have separate SS modules/ducers on front and back.