Garmin G3X Touch Pilot's Manual page 214

Hazard Avoidance
If, for any reason, a weather product is not refreshed within the Expiration Time
intervals (see table), the data is considered expired and is removed from the display.
This ensures that only data that is consistent with FIS-B broadcast data is displayed.
If more than half of the expiration time has elapsed, the color of the product age
displayed changes to yellow. The system displays dashes instead of a product age
when a product has expired.
The table below shows the FIS-B weather expiration time and the broadcast interval.
The broadcast interval represents the interval at which FIS-B GBTs broadcast new
signals that may or may not contain new weather data. It does not represent the rate
at which weather data is updated or new content is received.
FIS-B Products
NEXRAD Composite
Reflectivity (CONUS)
NEXRAD Composite
Reflectivity (Regional)
Cloud Tops Forecast
Winds and
Temperatures Aloft
Lightning
METAR
TAF
AIRMET
SIGMET
PIREP
194
Expiration
Time
~5 minutes precipitation
75 minutes
75 minutes
105 minutes
12 hours
75 minutes
1 minute (where available),
8 hours
12 hours
12 hours
As Available, then at 15
12 hours
minute intervals for 1 hour
4 hours
Garmin G3X Touch Pilot's Guide
Update Interval
(Minutes)
mode
10 minutes for clear air
As Available
1 hour
12 hours
5 minutes
As Available otherwise
8 hours
As Available
As Available
Broadcast
Interval
(Minutes)
15
2.5
15
10
5
5
10
5
5
10
190-01754-00 Rev. L