12-6
GTN 725/750 Pilot’s Guide
190-01007-03 Rev. C
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Charts
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
12.1.4 SiriusXM Weather Symbols and Product Age
When a weather product is active on the Map function or the Weather Data
Link function is selected, the age of the data is displayed on the screen. The age
of the data may not indicate the time between the current GPS time and the time
when the data is assembled, but rather a general indication of the time elapsed
from when the data is received by the GTN.
Updated weather data may or may not contain new weather data. Weather
data is refreshed at intervals that are defined and controlled by SiriusXM Satellite
Radio and its data vendors.
If for any reason, a weather product is not refreshed within the designated
intervals, the data is considered expired and is removed from the display.
This ensures that the displayed data is consistent with what is currently being
broadcast by SiriusXM Satellite Radio services. If more than half of the designated
time has elapsed from the time the data is received, the color of the product age
displayed changes to yellow.
WARNING: Do not use the indicated data link weather product age to
determine the age of the weather information shown by the data link
weather product. Due to time delays inherent in gathering and processing
weather data for data link transmission, the weather information shown by
the data link weather product may be significantly older than the indicated
weather product age.
The following table contains the expiration time and XM broadcast interval.
The expiration time is an elapsed time after which the data is considered
expired and is removed from the display. This ensures that the displayed data
is consistent with what is currently being broadcast by SiriusXM Satellite Radio
services. If more than half of the expiration time has elapsed from the time the
data is received, the color of the product age displayed changes to yellow.
The SiriusXM Weather broadcast interval is the time interval when
SiriusXM Satellite Radio broadcasts new signals that may or may not contain
new weather data. Weather data is broadcast at intervals that are defined and
controlled by SiriusXM Satellite Radio.
NOTE: SiriusXM Weather does not provide a timestamp for AIRMETs,
SIGMETs, City Forecasts, County Warnings, Cell Movement and TFR
products. Therefore, the unit does not display a product age indication
for these products.
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