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GPSMAP 4000 Series Owner’s Manual 
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In order to use XM Weather, you must have a Garmin GDL 30 or 30A XM receiver and an activated 
XM weather subscription. To use XM Audio, you must have the Garmin GDL 30A XM receiver 
and an XM Audio subscription. To connect the XM antenna and receiver and for subscription 
instructions, refer to the GDL 30/30A Marine Weather Satellite Receiver Installation Instructions.
If you do not have a receiver and a subscription to XM WX Weather, the weather features described 
in this section work only when the unit is in Simulator Mode.
Using XM WX Weather
The GDL 30/30A receives XM WX Weather data and shows it on your unit’s Navigation chart and 
other screens throughout the 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.com/weather 
for more 
information.) 
  NOTE: 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. For example, NEXRAD (NEXt Generation Weather 
RADar) data is broadcast at five minute intervals. When the Garmin unit is turned on or when a 
new feature is selected, the GDL 30/30A has to receive new data before it can be shown. You might 
experience a delay before weather data or a new feature appears on the map.
Setting the XM WX Weather Options
To configure the weather settings from the Home screen, select 
Weather
 > 
Weather Setup
. From 
this menu, you can turn the 
NEXRAD loop
 on or off and hide or show the weather 
legend
.
Viewing Precipitation Information
Precipitation shows NEXRAD radar, storm cells, lighting strikes, and hurricane warnings. To view 
precipitation from the Home screen, select 
Weather
 > 
Precipitation
.
Viewing NEXRAD Radar Information
NEXRAD shows precipitation from very light rain and snow up to strong thunderstorms in varying shades 
and colors. On the GPSMAP 4000 series unit, you can view NEXRAD information as an image of the 
latest update, or as an animated loop of the latest updates. To animate the NEXRAD loop, from the Home 
screen, select 
Weather
 > 
Weather Setup
 > 
NEXRAD loop
 > 
On
.
In the lower-left corner of the screen is a Time Stamp. The Time Stamp displays the elapsed time 
since the National Weather Service last updated the information.