XM Radio
I use a Delphi "Roady" XM reciever and love it. I've had good luck with the "home" style antenna sitting on the chart table. Gets excellent reception. It's larger than the one used for car installation, but still only about 3"X3", and designed to work indoors. Of course, they make special ones for boats, but I'm not sure it's really necessary. I use the FM transmit feature to get the signal to the stereo on the boat, but at home I directly connect it to a stereo system using RCA style wires. As long as your Pioneer tuner has an "out" plug and your player has "input" plugs, there's a wire that will fit it. Don't know much about the marine weather feature, but it does sound interesting. I hear they are also talking about beaming down movies at some point.