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Weather and Sea Surface Information

The GXM 51 receives XM Weather Radio data and shows it on your chartplotter. 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

information.) Any weather feature can change in appearance or interpretation if the source that provides the

information changes. XM Weather Radio data is broadcast at set rates. For example, NEXRAD Radar data is

broadcast at five minute intervals. When the marine network is turned on or when a new feature is selected, the

GXM 51 has to receive new data before it can be displayed. For this reason you may experience a delay before

weather data or a new feature appears on the map.

WARNING: The XM Weather Radio data is merely supplemental and advisory in nature and is not intended to be

relied up on as safety-critical information. You should always exercise caution and common sense when confronted

with severe weather conditions.

WARNING: XM WX Weather should not be used for hazardous weather penetration. Weather information is

approved only for weather avoidance, not penetration.

Weather-Related Broadcast Rates

NEXRAD Overview

NEXRAD Description

NEXRAD Radar is a Doppler radar system that has greatly improved the detection of meteorological events such

as thunderstorms, tornadoes, and hurricanes. An extensive network of NEXRAD stations provides almost complete

radar coverage of the continental United States, Alaska, and Hawaii, and the majority of Canada. The range of each

NEXRAD is 124 nautical miles.

NEXRAD Abnormalities

There are possible abnormalities regarding displayed NEXRAD images. Some, but not all, of those include the

following circumstances:

Ground clutter

Strobes and spurious radar data

Sun strobes, when the radar antenna points directly at the sun

Military aircraft deployment of metallic dust (chaff), which can cause alterations in radar scans

Interference from buildings or mountains, which may cause shadows

NEXRAD Limitations

Certain limitations exist regarding the NEXRAD radar displays. Some, but not all, are listed here for your awareness:

NEXRAD base reflectivity does not provide sufficient information to determine cloud layers or precipitation

characteristics (for example, determining between hail and rain).

GXM 51 Installation Instructions

Feature

NEXRAD

Cloud Tops

Storm Cells

Lightning

Wind

Pressure

Hurricanes

Visibility

Fronts

Sea-Surface Temperature

Wave Height

Wave Period

Wave Direction

Current Conditions

Forecasts

Sea-Surface Conditions

http://weather.xmradio.com/weather

Broadcast Rate

(minutes)

1.25

for more