I'm taking a Lowrance unit off of my boat tonight. I think it has a LGC 4000 on it. The writing has faded off of it but I'm pretty sure that when my 3000 quit working Lowrance sent me a 4000 and I had to update my software for it to work. I could be wrong, maybe it was a 2000 and they sent a 3000 ????
When I get it taken off tonight I will try to see what it is. It's on a LMS 332c.