(2013) Service Advisory 1328 Rev A: FIS-B NEXRAD Weather Reception and Display

AFFECTED PRODUCTS

Garmin ADS-B receivers connected to Garmin GTN 625/GTN 635/GTN 650/GTN 725/GTN 750 systems and GPS 400W/GNC 420W/GNS 430W/GPS 500W/GNS 530W Units.

DESCRIPTION

FIS-B weather data reception requires line-of-sight communication between the receiver and the ADS-B
ground station. Incomplete Regional and/or CONUS NEXRAD imagery displayed on the MAP and FIS-B
Weather Pages of the affected products is an indicator of poor FIS-B reception.

AFFECTED AREAS

Any area in the continental United States (CONUS) or Alaska where the distance from ADS-B ground
stations or the combined effect of distance and low altitude is sufficiently great to cause poor reception. A
good source of information for ground station coverage can be found at
http://www.faa.gov/nextgen/flashmap/

Reception will improve in some affected areas as the FAA completes the NextGen ADS-B ground station
infrastructure in 2014. However, due to line-of-sight broadcast characteristics, operators with properly
installed and functioning equipment may still receive incomplete FIS-B data when signal reception is
limited by the distance from ground stations combined with a low altitude.