Garmin aera 796, Pilot'S Manual

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Garmin aera 795/796 Pilot’s Guide 190-01194-00 Rev. A
82
Hazard Avoidance
Overview
GPS Navigation
Flight Planning
Hazar
d A
voidance
Additional F
eatur
es
Appendices
Index
• 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.
• Radar coverage only extends to 55°N.
• Any precipitation displayed between 52°N and 55°N is unknown.
neXrAD I
ntenSIty
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. Precipitation intensity is displayed using colors
corresponding to the dBZ values.
NEXRAD Data
RADAR Legend
SATELLITE MOSAIC
Satellite Mosaic displays infrared composite images of cloud cover taken by
geostationary weather satellites. The Satellite Mosaic provides up to seven levels of
cloud cover.
RADAR Legend
Satellite Mosaic/Cloud Tops Data