Wow, my GPS/Plotter tells me if there's something beneath the keel. It keeps me on the correct course, much better than the compass, it provides me with XTE information so I know just how far the winds have pushed me off the rum line, it provides with with speed over ground, depth, full sonar imaging, time to waypoint, distance to waypoint, time of day, L/L, tidal information, tidal current information, and much, much more. When I install the 3G Radar it will provide me with 24 miles of range with alarms for targets, provide incredible target information, and the ability to see things such as approaching thunderstorms at distances to 36 miles, which is usually sufficient time to make ready for bad weather conditions.
Additionally, when I get around to making the connections, I also have full engine information: Oil pressure, engine temperature, RPM, fuel level, and more. It's all right there, all on the display, and each parameter has alarms. It's right there in front of me and I can monitor the information constantly, while still using my primary safety device - my eyes.
So, while you're looking around and absorbing what you can see, which I'm also doing, I'm also absorbing information that you cannot see, which may be even more important, especially when bad weather is closing in from behind you. That 7-inch, high-definition screen sitting at the helm station with full sonar information and imaging can provide you with things the chart will never reveal. And, while you're looking at the chart, you're not looking at what's in front of you. With the GPS/Plotter at the helm station you can do both, plus see what's beneath you. And, with the addition of 3G radar, and the antenna on the mast, see what's over horizon - beyond your view from the cockpit.
Now, I'm not anti paper charts - I have them and use them. But, as previously stated, those charts, and chart books are frequently out of date. At least I can update the GPS/Plotter via the internet, and thanks to a $19 USB antenna, I have internet connections at most locations I anchor for the night. I can't update the charts as easily, and as inexpensively.