KC you have the same problem I had after going out with Dave this year, you saw how accurated his was when comming up to a spot and the contours are spot on!!! My problem is worse I already have a 520C on the front of the boat and a humminbird SI at the console!!!! After going with Dave I was about to swap and still may, in fact I think I'll sell the SI get another 520 and link them together!!! yeah that's the ticket. I had also bought the navionics bundle for the humminbird and the "2006" wasn't made aware to me until 3 months after installation, also the mapping is a nightmare I keep having to offset the maps 2 or 3 times each trip because there mapping overlaps!!! Geeze......

Get the 520 or 522 and enjoy!!! to many headaches for me and I can honestly say that because I have both on my Ranger right now!!!