If it is a Navionics+ Regions card, on your HDS unit, you should be able to go to "Chart Options", select "View" and then select "Fish'N'Chip! As long as your card is updated it should provide you 1-foot contour lines. The Navionics+ card is one that I'm used to, I was just wondering what kind of details and features some of the other cards had. Thanks Todd B.!