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9-7190-01004-03 Rev. B
Garmin GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
9.1.6 TIS Alerts
When the number of Traffic Advisories (TAs) on the Traffic Map Page increases
from one scan to the next, the following occur:
•Asingle“Traffic” voice alert is generated.
•ATRAFFICAnnunciationappearsatthebottomofthedisplay,ashingfor
5 seconds and remaining displayed until no TAs are detected in the area.
To reduce the number of nuisance alerts due to proximate aircraft,
the “Traffic” voice alert is generated only when the number of TAs
increases. For example, when the first TA is displayed, a voice and visual
annunciation are generated. As long as a single TA remains on the display,
no additional voice alerts are generated. If a second TA appears on the
display or if the number of TAs initially decreases and then subsequently
increases, another voice alert is generated.
A “Traffic Not Available” (TNA) voice alert is generated when the TIS service
becomes unavailable or is out of range.
Traffic may not be displayed in the radar coverage area due to the following:
•Radar site TIS Mode S sensor is not operational or is out of service.
•Trafc or requesting aircraft is beyond the maximum range of the TIS-
capable Mode S radar site.
•Trafcorrequestingaircraftisabovetheradarsiteintheconeofsilenceand
out of range of an adjacent site.
•Trafcor requestingaircraft isbelow radar coverage.In at terrain, the
coverage extends from about 3000 feet upward at 55 miles. Terrain and
obstacles around the radar site can further decrease radar coverage in all
directions.
•Trafcdoesnothaveanoperatingtransponder.