Garmin Aera 660 Pilot's Manual page 146

Hazard Avoidance
Do not rely solely upon the display of traffic information to
WARNING:
accurately depict all of the traffic within range of the aircraft. Due to lack
of equipment, poor signal reception, and/or inaccurate information from
aircraft or ground stations, traffic may be present that is not represented
on the display.
Viewing Traffic Status:
1) From the Main Menu, touch Tools.
2) Touch Data Link.
SYSTEM STATUS
The traffic system status is annunciated in the upper right corner of the Map Page,
as well as the bottom of the dedicated Traffic Page.
Traffic Icon
Full traffic services available for an ADS-B participating aircraft
(ground linked TIS-B, FIS-B and ADS-R, and Air-to-Air ADS-B). If using
a compatible device on a non-participating aircraft, this traffic icon
may still be visible when within the service area of any participating
aircraft. As a non-participating aircraft the compatible device is only
receiving TIS-B traffic information for traffic within 15 nm and 3,500'
of the participating aircraft.
Limited traffic services available (may be limited to Air-to-Air ADS-B)
No Traffic Data Available
Some compatible devices also have a pressure altitude sensor to aid in displaying
the relative altitude of received traffic information. If the compatible device is used
onboard a pressurized aircraft, the pressure altitude sensor should be turned off.
130
System Status
Traffic Modes
Garmin aera 660 Pilot's Guide
190-02017-20 Rev. E