Garmin GDL 88 User Manual

5-1

190-01122-03  Rev. A

GDL 88 ADS-B Transceiver Pilot’s Guide

The Flight Information Services (FIS-B) function is capable of displaying textual 

and graphic weather information with GDL 88 installations. No subscription for
FIS-B services is required with the GDL 88.

The FIS-B Function is based on a ground-to-air data link and requires that

the appropriate ground systems are broadcasting weather data and the aircraft is 
within reception range of the Ground Broadcast Transceiver (GBT). 

The products are transmitted from the UAT (978 MHz) ground stations on a

regular basis, in accordance with the following table: 

CONUS NEXRAD

60

15

15

Regional NEXRAD

30

2.5

5

AIRMETs

60

5

As Available  

(Typically 20 minutes)

SIGMETs

60

5

As Available (Typically 20 

minutes), then at 15 minute 

intervals for 1 hour

METARs

90

5

1 minute (where available), 

As Available otherwise 

(Typically ≤ 20 minutes)

Winds and 
Temperatures Aloft

90 or at the 

end of the 

valid period

10

12 hours

Pilot Weather 
Report (PIREP) 

(Blue - Regular, 

Yellow - Urgent)

90

10

As available  

(Typically 20 minutes)

TAFs

60

10

8 hours

NOTAMs

60

10

As available  

(Typically 20 minutes)