Garmin GNC 355 Pilot's Manual page 232

Hazard Awareness
TRAFFIC GROUPS
When the Traffic Grouping function is active, traffic within close proximity of each
other may display as a group.
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OFF SCALE TRAFFIC ALERTS
TRAFFIC OVERLAY STATUS ICON (MAP ONLY)
This icon appears on Map when the traffic overlay is active. It is
absent when the overlay function is off.
An "X" appears over the icon when the overlay is on but unavailable.
5-28
Asterisk indicates that the target belongs to a group
Relative proximity of the closest target determines color
Depiction is of the most immediate threat
Off scale (out of range) traffic alerts are depicted as half
yellow symbols on the outermost range ring at the correct
bearing.
Map Traffic Overlay
Pilot's Guide 190-02488-01 Rev. B