I inserted a cartridge that covers all of Long Island Sound and eastward to Watch Hill, Rhode Island, and pushed the "chart goto" key to display the chart. I zoomed in on my location at Rex Marine in South Norwalk, then pressed the enter key plus 9 to load the chart setup menu. From this menu, I selected the type of information I wanted to display. The CR42 gives you about 40 choices, so you can make the chart as detailed or as clear as you want. I could also have displayed all the information that normally appears on a paper chart of the same area. I chose natural features, landmarks, soundings, lights, buoys, landfilling, north up, true motion (boat moves across the screen) and large chart area (normal re-draw time for pan and scroll). I know this harbor well and enjoyed seeing familiar marks and features on the CR42's wonderfully clear, sharp display.