User manual GARMIN G1000

[. . . ] G1000 TM Optional Equipment Pilot's Guide Record of Revisions Revision Date of Revision Revision Page Range A 12/08/04 8B-1 - 8B-43 B 01/21/05 8B-1 - 8B-43 Description Initial release. Changed document title to "Optional Equipment Addendum" from "Optional Interface Addendum". Changed all references throughout the Addendum from "interfaces" to "equipment". Added a note on page 8B-1 informing the user that this Addendum is generic, not specific to any OEM airframe. [. . . ] D 11-18 Garmin G1000 Optional Equipment Addendum GDL 69/69A Displaying Weather on the Weather Data Link Page (Figure 11. 4. 3) The Weather Data Link Page displays all available weather products. The display of the weather data can either be selected by softkeys located at the bottom of the display or through the Weather Data Link Setup menu. Turn the small FMS knob to select the Weather Data Link Page. Figure 11. 4. 3 Weather Data Link Page 190-00470-00 Rev. D Garmin G1000 Optional Equipment Addendum 11-19 GDL 69/69A Weather Data Link Page Softkeys The following softkeys perform the GDL 69 weather functions on the Weather Data Link Page: NEXRAD ­ press the NEXRAD softkey to show NEXRAD weather and radar coverage information (both are activated at the same time). Composite data from all of the NEXRAD radar sites in the United States is shown. This data is composed of the maximum reflectivity from the individual radar sweeps. The display of the information is color-coded to indicate the weather level severity. Refer to the legend for a description of the color code. NOTE: WSR-88D weather surveillance radar or NEXRAD (NEXt generation 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. The unobstructed range of each NEXRAD is 124 nautical miles. NEXRAD Limitations Certain limitations exist regarding the NEXRAD radar displays. Some, but not all, are listed here for the user's awareness: · NEXRAD base reflectivity does not provide sufficient information to determine cloud layers or precipitation characteristics (hail vs. · NEXRAD base reflectivity is sampled at the minimum antenna elevation angle. An individual NEXRAD site cannot depict high altitude storms at close ranges, and has no information about storms directly over the site. Therefore, when zoomed in on the display, each square block is 2 kilometers. The intensity level reflected by the square will be the highest level sampled within the 2 kilometer square area. NEXRAD Intensity Colors are used to identify the different NEXRAD echo intensities (reflectivity) measured in dBZ (decibels of Z). "Reflectivity" is the amount of transmitted power returned to the radar receiver. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. The dBZ values increase as the strength of the signal returned to the radar increases. NEXRAD Abnormalities There are possible abnormalities regarding displayed NEXRAD images. Some, but not all, of those include: · Ground Clutter · Strobes and spurious radar data · Sun strobes, when the radar antenna points directly at the sun · Interference from buildings or mountains, which may cause shadows · Military aircraft deploy metallic dust which can cause alterations in radar scans 11-20 Garmin G1000 Optional Equipment Addendum 190-00470-00 Rev. D GDL 69/69A ECHO TOP ­ press the ECHO TOP softkey to show the location, elevation, and direction of the highest radar echo. This may not indicate the top of a storm or clouds, only the highest radar return echo. [. . . ] D GDL 69/69A Category The `Category' field of the XM Radio Page displays the currently selected category of audio. Categories of channels such as jazz, rock, or news, can be selected to list the available channels for a type of music or other contents. One of the optional categories is `PRESETS' if the user desires to view what channels have been programmed. Figure 11. 4. 8 Volume Control To adjust the volume: 1. Press the VOL ­ softkey to reduce volume or press the VOL + softkey to increase volume. [. . . ]