I have a S6 card. I went onto the Navionics website last night and it literally drove me crazy trying to navigate thru the site. It kept bringing me back to basically the same pages over and over. I worked on it for about an hour and could do nothing. I am very computer literate and have no problems navigating websites. This is the worst one I have ever encountered. I will have to call the company and ask for some guidance. I am very disappointed with this product. Both the product and the website . I'll keep you posted. Thanks for you comments.