I have a ruggedized notebook PC (Panasonic Toughbook) that connects to my GPS via a NMEA connection (serial cable, in other words), and run First Mate by the Cap'N. This gives me the equivalent of a chart plotter, along with all the usual capabilities of a notebook computer. It has served me extremely well. When underway, the PC is bungeed to the salon table where I can see it from the cockpit.
As far as being able to connect wirelessly and being able to connect to radars/other instruments, I'm not aware of that level of sophistication being available. However, with the increasing popularity of wireless networks in homes and the workplace, who knows what may become available.
One Step Closer
Lake St. Clair, MI