I ended up with the Lowrance Elite 7 for several reasons. First, I was familiar with the various functions so I didn't have to relearn from scratch. Second, the connectors were the same so I didn't have to yank out the old and put in the new. I could use the electric and transducer cables and the old transducer images are remarkable. Last but not least, the price. I researched the internet and found this one for $500 plus free shipping while it is listed for $800. The old 520c unit had a 5 inch screen. This Elite 7 is a step up.