Garmin GDL 88 manual Nexrad Intensity

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5.1.3NEXRAD 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.

5.1.4NEXRAD

When enabled, NEXRAD weather information is shown. 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. FIS-B NEXRAD does not differentiate between frozen and liquid precipitation. Refer to the previously shown legend for a description of the color code.

The NEXRAD option has selections of Regional, CONUS, or Combined NEXRAD (only available with GTN units). CONUS NEXRAD includes a composite of available NEXRAD radar imagery across the 48 states. Regional NEXRAD is a composite of available NEXRAD radar imagery in a local area, showing a more detailed image than CONUS NEXRAD.

Continental US NEXRAD (CONUS)

The Display CONUS NEXRAD selection shows NEXRAD radar information for the entire continental United States. CONUS NEXRAD data is updated every 15 minutes. The resolution of displayed CONUS NEXRAD data is approximately 10 kilometers (5.4 NM). The intensity level reflected by the square will be the highest level sampled within the area covered by each block.

Regional NEXRAD

The Regional NEXRAD selection shows regional NEXRAD radar information within 500 miles of the aircraft location. The resolution of displayed Regional NEXRAD data is approximately two kilometers (1.08 NM).

Combined NEXRAD

Regional NEXRAD data within 150 NM of the aircraft location and CONUS NEXRAD data everywhere else. The two types of NEXRAD are separated by a white stippled border. This boundary is updated whenever new Regional or CONUS NEXRAD data is received.

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GDL 88 ADS-B Transceiver Pilot’s Guide

190-01122-03 Rev. A

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Contents GDL October 190-01122-03 Rev. a GDL 88 ADS-B Transceiver Pilot’s Guide 190-01122-03 Rev. a Record of Revisions GDL 88 ADS-B Transceiver Pilot’s Guide Contents Index Index-1 Introduction GDL 88D System FunctionsGDL 88 Part Numbers Traffic alertingServices if you’re equipped with an ADS-B In solution ADS-B System OverviewADS-B Coverage vs Altitude Planned for 2014 FAA Illustration ADS-B Broadcast ADS-B GNS GTNAutomatic Dependent Surveillance Rebroadcast ADS-R ADS-R Operation FAA IllustrationTraffic Information Service Broadcast TIS-B Flight Information Service Broadcast FIS-B GDL 88 ADS-B OUT GDL 88 ADS-B Out DataSelf-Interrogation Pressure Altitude Broadcast Inhibit PabiAnonymous Mode Air/Ground DeterminationThis page intentionally left blank GDL 88 ADS-B GDL 88 ADS-B In DataTraffic Traffic Applications SURF, AIRB, etcAirb Display with the GTN GDL 88 ADS-B Transceiver Pilot’s Guide GDL 88 Integration with TCAD/TAS/TCAS TCAS/TASNo-Heading Source Traffic Information Conflict Situational Awareness CSALook This page intentionally left blank Weather Regular basis, in accordance with the following tableFIS-B Nexrad Nexrad Abnormalities Nexrad LimitationsNexrad Intensity NexradFIS-B PIREPs FIS-B TFRsFIS-B METARs FIS-B Winds and Temperatures Aloft SIGMETs and AIRMETsGDL 88 Only No Display Installation ConfigurationsPossible Installation Configurations Interfaces Glossary ADS-BHAT Tcas This page intentionally left blank Troubleshooting AppendixServicing Your Unit Contact GarminSoftware License Agreement Limited Warranty Index GDL 88 ADS-B Transceiver Pilot’s Guide Page Garmin Corporation Garmin International, Inc