Page 11 from 48
GXM 30 XM Radio Smart Antenna Owner’s Manual 4
Step 5: Conﬁrm all Components of your Service
XM WX Weather: Keep your Garmin unit turned on to
ensure you receive the XM signal. The XM signal is being
received when the components of the selected service
package are displayed in the Weather Products list on the
Information sub tab. Do not turn off the Garmin unit until the
name of the selected service package is displayed in the
Service Level ﬁeld (see Step 6).
XM Radio: Highlight the Audio sub tab and verify that
channels 7, 9, 47, and 122 are being received. This
indicates that all channels on XM’s basic radio service
are being received. If within an hour the XM WX Weather
and/or the XM Radio service has not activated, call XM WX
customer care at 800-985-9200 to validate the activation
of XM services. The customer care representative can
refresh the activation signal or you can do this yourself a
www.xmradio.com/refresh by entering your radio ID where
Step 6: Save the Service Package
After the service package name appears in the Service
Level ﬁeld, turn off the Garmin unit.
Step 7: Add Features to your Unit
When you turn on the GXM 30 after completing Step 6, you
are ready to add weather features to the unit’s Map Page
and set your new favorite channels.
GETTING STARTED > SUBSCRIBING TO XM SERVICE
Page 12 from 48
5 GXM 30 XM Radio Smart Antenna Owner’s Manual
XM WX WEATHER FEATURES
Displaying Weather Information
The GXM 30 receives XM WX Weather data and shows it on
the Garmin unit’s Map Page 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.) 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 30 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 30 has to
receive new data before it can be shown. You may experience a
delay before weather data or a new feature appears on the map.
To display weather features on the Garmin unit’s
1. Press the MENU key.
2. Highlight Show Weather,
and press ENTER.
To display weather features on the map, press the MENU key, highlight Show Weather, and press ENTER.
XM WEATHER FEATURES > DISPLAYING WEATHER INFORMATION
Page 13 from 48
GXM 30 XM Radio Smart Antenna Owner’s Manual 6
NEXRAD or NEXt Generation Weather RADar displays precipitation from very light rain and snow up to strong thunderstorms in
varying shades and colors. In the lower left corner of the screen is a Time Stamp. The Time Stamp displays the elapsed time
since the National Weather Service provided the displayed information. To display a legend showing the colors for Rain, Mix,
and Snow, press
MENU, highlight Weather Legend, and press ENTER. NEXRAD can be displayed independently or with
a variety of other weather information. For information on NEXRAD Limitations, Abnormalities, and Intensity, see pages
XM WEATHER FEATURES > NEXRAD RADAR
Page 14 from 48
7 GXM 30 XM Radio Smart Antenna Owner’s Manual
Satellite Mosaic displays infared composite images of cloud cover taken by geostationary weather satellites. The Satellite Mosaic
provides up to seven levels of cloud cover.
XM WEATHER FEATURES > SATELLITE MOSAIC
Cloud Tops Legend
Page 15 from 48
GXM 30 XM Radio Smart Antenna Owner’s Manual 8
Lightning strikes are represented by lightning bolt icons, as shown in the images below. Lightning appears on the map if strikes
were detected within the last seven minutes. The ground-based lightning detection network only detects cloud-to-ground lightning.
XM WEATHER FEATURES > LIGHTNING
Lightning bolts indicate a cloud-to-ground lightning strike.