Garmin 010-00730-00 User Manual

XM WX Weather Features

The GXM 40 receives XM WX Weather data and shows 

it on the Map and Weather pages of the Garmin unit. The 

weather data for each feature comes from reputable weather 

data centers such as the National Weather Service and the 

Hydrometerological Prediction Center. (See the XM WX 

Satellite Weather Web site at 

http://weather.xmradio 

 for more information.) Any weather feature 

can change in appearance or interpretation if the source that 

provides the information changes. XM WX Weather data 

is broadcast at set rates (see 

page 33 

for all weather-related 

broadcast rates). For example, NEXRAD Radar data is 

broadcast at five-minute intervals. When the Garmin unit 

is turned on or when a new feature is selected, the GXM 

40 has to receive new data before it can be displayed. You 

can experience a delay before weather data or a new feature 

appears on the map.