Available on select vehicles, NavWeather delivers detailed graphical weather overlays on your compatible automotive GPS device using Threat Matrix™ technology. You get current and future road conditions (slippery, wet, icy) and atmospheric conditions (rain, sleet, snow) using the same real-time data delivery as the XM® WX service. Combine those services with National Weather Service warnings and 3-day forecasts for more than 100 cities and you get the ultimate in driver protection and awareness.