I have an old garmin gps chartplotter and an older Interphase (cool company in California) fish finder. I was on a friends boat in Nootka Sound last year and he used a Lowrance HD that had a really really nice/accurate chart display so I looked into upgrading with a Lowrance HD unit. I may not be that smart, but I couldn't follow the logic of the product line on the web. I couldn't figure out what the difference was between models and the ones my friends have currently.... are already discontinued after a year or so. After spending too much time on trying to follow what models were even available, I gave up. Like boats, the best salesman a company has is the actual unit in the boat and Lowrance may be losing sales while they are trying to chase the first to market/new technology buyers. Their gear must be pretty good, but I don't want to be lost in upgrades so I'm looking at Furuno now. 2 cents.