Garmin GDL 88 manual Nexrad Abnormalities, Nexrad Limitations

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NOTE: FIS-B NEXRAD does not differentiate between frozen and liquid precipitation. The FIS-B NEXRAD intensity colors (as shown below) may differ from the intensity colors from other providers.

5.1.1NEXRAD Abnormalities

There are possible abnormalities regarding displayed NEXRAD images. Some, but not all, causes of abnormal displayed information include:

•Ground Clutter

•Strobes and spurious radar data

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

•Military aircraft deploy metallic dust which can cause alterations in radar scans

•Interference from buildings or mountains, which may cause shadows

•Scheduled maintenance may put a radar off-line

5.1.2NEXRAD Limitations

Certain limitations exist regarding the NEXRAD radar displays. Some, but not all, are listed for the user’s awareness:

•NEXRAD base reflectivity does not provide sufficient information to determine cloud layers or precipitation characteristics (hail vs. rain, etc).

•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.

•The resolution of displayed Regional NEXRAD data is approximately two kilometers and the resolution of displayed CONUS NEXRAD data is approximately 10 kilometers. Therefore, when zoomed in on the display, each square block is two kilometers (1.08 NM) or 10 kilometers (5.4 NM) on a side. The intensity level reflected by the square will be the highest level sampled within the area covered by each block.

190-01122-03 Rev. A

GDL 88 ADS-B Transceiver Pilot’s Guide

5-3

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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 GDL 88D System Functions IntroductionTraffic alerting GDL 88 Part NumbersADS-B System Overview Services if you’re equipped with an ADS-B In solutionADS-B Coverage vs Altitude Planned for 2014 FAA Illustration GNS GTN ADS-B Broadcast ADS-BADS-R Operation FAA Illustration Automatic Dependent Surveillance Rebroadcast ADS-RTraffic Information Service Broadcast TIS-B Flight Information Service Broadcast FIS-B GDL 88 ADS-B Out Data GDL 88 ADS-B OUTPressure Altitude Broadcast Inhibit Pabi Self-InterrogationAir/Ground Determination Anonymous ModeThis page intentionally left blank GDL 88 ADS-B In Data GDL 88 ADS-BTraffic Applications SURF, AIRB, etc TrafficAirb Display with the GTN GDL 88 ADS-B Transceiver Pilot’s Guide TCAS/TAS GDL 88 Integration with TCAD/TAS/TCASConflict Situational Awareness CSA No-Heading Source Traffic InformationLook This page intentionally left blank Regular basis, in accordance with the following table WeatherFIS-B Nexrad Nexrad Limitations Nexrad AbnormalitiesNexrad Nexrad IntensityFIS-B METARs FIS-B TFRsFIS-B PIREPs SIGMETs and AIRMETs FIS-B Winds and Temperatures AloftPossible Installation Configurations Installation ConfigurationsGDL 88 Only No Display Interfaces ADS-B GlossaryHAT Tcas This page intentionally left blank Appendix TroubleshootingContact Garmin Servicing Your UnitSoftware License Agreement Limited Warranty Index GDL 88 ADS-B Transceiver Pilot’s Guide Page Garmin Corporation Garmin International, Inc
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