Summary: I have had my Garmin 440s for 4 years. Decided to update my maps for my boat/fishfinder. All I need is new marine maps. Why can't I just go onto the website and type in the name of my device and see what updates are available?
Summary: This is the best unit I have ever purchased. Easy to use and read, my kids can even operate it with ease. For the money though, I wish I would have spent another $100.00 an got the 541. It's exactly the same unit,just with a larger screen.