Now Furuno (furunousa.com) has shown that it's possible to display and even control marine radar on a mobile device. The new DRS4W 1st Watch Wireless Radar combines a compact 12½-pound 4 kW radome with an iPad or iPhone. It uses a free app to display radar returns on up to two devices at once. A small antenna on the bottom of the dome transmits the wireless radar signal to the mobile device. A simple Apple interface lets you change range from 0.125 to 24 nautical miles. With the iPad, you can also determine target bearing and distance. You need to wire 12-volt power to the dome, which draws less than 2 amps, but gone is the large, bulky cable between the radome and display. I had a chance to use it along the Intracoastal near Sanibel, Florida, and found the system to perform flawlessly.