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owner’s manual GXM 40 Radio Smart Antenna ®...
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Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other Garmin products.
This manual covers the XM WX Weather and XM Radio features of the GXM 40 when viewed on a Garmin unit. To get the most out of your new system, take the time to go through this manual and the Owner’s Manual for your unit.
Introduction Serial Number for the GXM 40 Use the line below to record the serial number in case it is lost, is stolen, or needs service. The serial number is located on the bottom of your unit. Keep your original sales receipt in a safe place or attach a photocopy inside the manual.
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Warning: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This Notice is provided in accordance with California’s Proposition 65. See www.garmin.com/prop65 for more information. GXM 40 Owner’s Manual...
Servicing Your Unit The Garmin GXM 40 has no user-serviceable parts. Should you ever encounter a problem with your unit, take it to an authorized Garmin dealer for repairs, or contact Garmin Product Support at 1-800-800-1020. The GXM 40 is fastened shut with screws. Any attempt to open the case to change or modify the unit in any way voids your warranty and may result in permanent damage to the equipment.
Position the GXM 40 where it has a clear view of the sky, for example, on the outside of the vehicle or behind the windshield of the vehicle. Connect the GXM 40 to the USB port on the Garmin unit.
Displaying Weather Information 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.
METAR A METAR or METeorological aeronautical report is an international code used for reporting weather observations. If METAR data is available for an airport, a color-coded flag is shown next to the airport. To view the METAR data, select the flag with the map pointer.
XM WX Weather Features AIRMET An AIRMET or airman’s METeorological Information can potentially affect all aircraft. This data can be especially helpful for pilots of light aircraft that have limited flight capability or instrumentation. An AIRMET must affect or be forecast to affect an area of at least 3,000 square miles at any one time.
SIGMET A SIGMET (Significant METeorological Forecast) advises of weather that is potentially hazardous to all aircraft. In the contiguous United States, the following items are covered: severe icing, severe or extreme turbulence, volcanic ash, dust storms, and sandstorms that lower visibility to less than three statute miles.
XM WX Weather Features A Temporary Flight Restriction (TFR) temporarily restricts all aircraft from entering the selected airspace unless a waiver has been issued. TFRs are routinely issued for occurrences such as sporting events, dignitary visits, military depots and forest fires. TFRs are represented as an area highlighted by red (active) or yellow (not yet active). To view information about the TFR, select it with the map pointer.
Terminal Aerodrome Forecasts are issued by the National Weather Service for pilots. They include 24-hour forecasts on wind, visibility, expected weather conditions, and wind shear. Terminal Aerodrome Forecast Terminal Aerodrome Forecast GXM 40 Owner’s Manual XM WX Weather Features...
XM WX Weather Features Winds Winds Aloft Aviation units display winds using wind barbs or a wind streamline depending on the zoom range of the map. Similar to marine and automotive units, the wind barbs indicate wind speed and direction. Arrows indicate the direction of the wind streamline.
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Surface Winds Marine and automotive units show surface winds. The barb attached to the circle points in the direction of the wind. Wind speed is indicated by different flags attached to the barb. Wind Direction Wind Direction Calm Calm 5 knots 5 knots 10 knots 10 knots...
XM WX Weather Features NEXRAD Radar NEXRAD or nEXt Generation Weather raDar displays precipitation, from very light rain and snow to strong thunderstorms, in varying shades and colors. The time stamp in the lower-left corner of the screen displays the elapsed time since the National Weather Service provided the information being displayed.
XM WX Weather Features Echo Tops Echo Tops are derived from NEXRAD radar and indicate the highest altitude at which precipitation is falling. Echo Tops at or above the altitude you select are displayed in 5,000 foot increments up to 70,000 feet. Echo Tops can be helpful in determining the severity of thunderstorms, where higher altitudes equate to more intense thunderstorms.
Surface Pressure This feature displays pressure isobars and pressure centers. The isobars connect points of equal pressure. Pressure readings can help determine weather and wind conditions in an area. High-pressure areas generally are associated with fair weather. Low-pressure areas generally are associated with clouds and the chance of precipitation. Isobars that are packed closely together show a strong pressure gradient.
XM WX Weather Features Lightning Lightning bolt icons represent lightning strikes, as shown in the image below. Lightning strikes appear on the map if strikes have been detected within the last seven minutes. The ground-based lightning detection network only detects cloud-to-ground lightning.
Storm Cells The Storm Cells feature displays storms and the projected path of storms in the immediate future. Marine and automotive units also show the size of the storm cell. The direction in which the red cone is pointing (from the narrow end to the wide end) indicates the projected path of the storm cell.
XM WX Weather Features Freezing Level Freezing Level shows contours for the lowest forecast altitude where icing conditions are likely to occur. Freezing Level Contours Freezing Level Contours Forecast Forecast displays fronts, high- and low-pressure centers, and city conditions. The forecast can be viewed in 12-hour increments for the next 48 hours.
Fronts The Fronts feature displays the lines indicating the leading edge of an air mass that is replacing an existing air mass. This feature also displays pressure centers. Pressure centers are represented by a large red “L” for low-pressure centers or a large blue “H”...
XM WX Weather Features Hurricanes The Hurricanes feature shows the current position of a hurricane, a tropical storm, or a tropical depression, as well as its projected path (indicated by a red line). The darkened squares that appear along the red line indicate the projected locations received from the National Hurricane Center.
County Warnings When the National Weather Service issues a weather warning for a county, the county is highlighted with the color corresponding to the warning. To view information about the warning, select the county with the map pointer. Tornado warning Tornado warning Severe thunderstorm warning Severe thunderstorm warning...
XM WX Weather Features XM Radio The XM Audio feature requires a subscription to XM Radio. (See page 7 for more information about subscribing to XM services.) You can scan channels by category and save them to a favorites list. You can turn the XM audio output on and off.
Visibility Visibility is the forecasted maximum horizontal distance that can be seen at the surface. Contour lines on the Visibility display show the forecasted change in surface visibility. In the example below, visibility ranges from 1 mile to 4.5 miles. Visibility Contour Lines Visibility Contour Lines GXM 40 Owner’s Manual...
XM WX Weather Features Water Temperature The Water Temperature feature displays the surface temperature of the water. Isotherm lines indicate the temperature breaks. Water Temperature Water Temperature Wave Period The Wave Period feature provides the time (in seconds) between successive waves. Wave Period Wave Period GXM 40 Owner’s Manual...
Wave Direction The Wave Direction feature shows the direction in which waves are moving, as indicated by the direction of the red arrow. Wave Direction Wave Direction GXM 40 Owner’s Manual XM WX Weather Features Wave Height The Wave Height feature displays wave heights. The wave heights for an area are separated by contour lines.
XM WX Weather Features Marine Warnings When a Marine Warning is issued, the area of the warning is highlighted in red. To view information about the warning, select the warning area with the map pointer. Marine Warnings Marine Warnings Marine Warning Detailed Information Marine Warning Detailed Information GXM 40 Owner’s Manual...
Buoy Reports Report readings are taken from buoys and coastal observation stations. These readings are used to determine air temperature, dew point, water temperature, tide, wave height and period, wind direction and speed, visibility, and barometric pressure. Buoy Selected With Map Pointer Buoy Selected With Map Pointer GXM 40 Owner’s Manual XM WX Weather Features...
Feature Broadcast Rates Data Broadcast Feature NEXRAD Radar 5 min. Satellite Mosaic 15 min. Storm Cells 1.25 min. Lightning 5 min. Surface Winds 12 min. Surface Pressure 12 min. Hurricane Track 12 min. Visibility Forecast 12 min. Fronts 12 min. Water Temperature 12 min.
Appendix 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.
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NEXRAD Intensity Colors are used to identify the different NEXRAD echo intensities (reflectivity) measured in dBZ (decibels of Z). Reflectivity (designated by the letter Z) is the amount of transmitted power returned to the radar receiver. The dBZ values increase as returned-signal strength increases.
Part 15 regulations. Limited Warranty This Garmin product is warranted to be free from defects in materials or workmanship for one year from the date of purchase. Within this period, Garmin will, at its sole option, repair or replace any components that fail in normal use.
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DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
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Distributor warranties are only valid in the area of intended distribution. Units purchased in the United States or Canada must be returned to the Garmin service center in the United Kingdom, the United States, Canada, or Taiwan for service.
BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. Garmin grants you a limited license to use the software embedded in this device (the “Software”) in binary executable form in the normal operation of the product.
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This information is provided “as is” and XM and Garmin disclaim any and all warranties, express and implied, with respect thereto or the transmission or reception thereof. XM...
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“AS IS” WITHOUT ANY WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. ALL SUCH WARRANTIES OR REPRESENTATIONS (INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT) ARE HEREBY DISCLAIMED. b) LIMITATIONS OF LIABILITY. WE ARE NOT RESPONSIBLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES RELATING TO THE USE OF THE RADIO SERVICE, WHETHER BASED ON NEGLIGENCE OR...
Appendix DAFIF product. This product was developed using DAFIF, a product of the National Geospatial-Intelligence Agency. TFR Data Temporary Flight Restriction (TFR) data is provided by the FAA and may not be updated outside of normal business hours. Confirm data currency though alternate sources and contact your local FSS for interpretation of TFR data.