In fact, the same data real pilots and marine professionals have come to rely on. XM's sophisticated Threat Matrix technology enables easy-to-read, detailed graphical weather overlays on your GPS navigation system for maximum driver awareness at all times.

Your NAV interprets the data for you and informs you of current and future weather and road conditions (slippery, wet, icy, etc.) as well as atmospheric conditions (rain, sleet, snow, wind, fog, precipitation intensity, etc.). National Weather Service warnings and 3-day city weather forecasts are also provided.