Garmin Cirrus Perspective SR22T, Reference Manual

Page: 85 / 192

Cirrus Perspective ™ by Garmin – Cockpit Reference Guide for the SR20/SR22/SR22T
190-00821-09 Rev. A
67
Hazard Avoidance
Flight
Instruments
EIS
Nav/Com/
XPDR/Audio
AFCS
GPS Nav
Flight
Planning
Pr
ocedur
es
Hazar
d
Avoidance
Additional
Featur
es
Abnormal Oper
ation
Annun/
Alerts
Appendix
Index
6)
The ‘SEND REQ” button is highlighted and a countdown timer is displayed
in the ‘REQUEST STATUS’ based on the currently selected update rate.
Press the
ENT Key to immediately send an immediate GFDS Data Request.
Or
:
Press the
FMS
Knob to return to the GFDS Weather Data Link Page.
Worldwide Weather Products
Precipitation
Precipitation data is not real-time. The lapsed time between collection, processing,
and dissemination of radar images can be significant and may not reflect the current
radar synopsis. Due to the inherent delays and the relative age of the data, it should
be used for long-range planning purposes only.
NOTE:
Precipitation data cannot be displayed on the Navigation Map Page
at the same time as terrain.
Displaying Precipitation Weather Information
1)
Select the
MAP
Softkey (for the PFD Inset Map, select the
INSET
Softkey).
This step is not necessary on the GFDS Weather Data Link Page.
2)
Select the
PRECIP
Softkey.
Radar data shown represents lowest level, base reflectivity, of radar returns. The
display of the information is color-coded to indicate the weather severity level. All
weather product legends can be viewed on the GFDS Weather Data Link Page. For
the Precipitation legend, select the
LEGEND Softkey when Precipitation is selected
for display.
Precipitation Limitations
Radar images may have certain limitations:
• Radar base reflectivity does not provide sufficient information to determine cloud
layers or precipitation characteristics (wet hail vs. rain). For example, it is not
possible to distinguish between wet snow, wet hail, and rain.
• Radar base reflectivity is sampled at the minimum antenna elevation angle. An
individual radar site cannot depict high altitude storms at close ranges. It has
no information about storms directly over the site.
• When zoomed in to a range of 30 nm, each square block on the display represents
an area of four square kilometers.