Garmin G500 Pilot's Manual page 136

Automatic Flight Following (AFF)
The G500 system, when combined with a GSR 56 Iridium datalink, can send
position reports that contain data as required by the U.S. Government Automated
Flight Following system. The GSR 56 account will allow configuration to forward
data to the Automated Flight Following system.
1) While viewing the Position Reporting function, press the small MFD knob to
select the Report Type.
2) Turn the small MFD knob to highlight "AFF" and then press the ENT.
Figure 3-94 Select Automatic Flight Following (AFF) Reporting Type
3) Turn the small MFD knob to select "OFF" or the default "Every 2 Min" value.
Figure 3-95 Select AFF Reporting Period Frequency
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Garmin G500 Pilot's Guide 190-01102-02 Rev. E