Exactly what my title says? I was updating my account with XM and it said my radio supports XM Weather. So by "radio" do the mean my D3 or do they mean my XM brain as the "radio"?

Mule

Not sure...never heard of a specific "weather" option for the D3, or XM in general. XM carries weather channels for specific (larger) cities, though...and that's free, afaik.