Garmin HTAWS User Guide - Page 10

Part One: Section 1 TIS Operation and Symbology The TIS audio alert is generated from the GTX 330 whenever the number of Traffic Advisories on the 400W/500W display increases from one scan to the next. Limiting Traffic Advisories only reduces the "nuisance" alerting due to proximate aircraft. For example, when the first Traffic Advisories appears on the TIS display, the user is alerted audibly. So long as a single aircraft remains on the TIS display, no further audio alert is generated. If a second (or more) aircraft appears on the display, a new audio alert is sounded. If the number of Traffic Advisories on the TIS display decreases and then increases, a new audio alert is sounded. The TIS audio alert is also generated whenever TIS service becomes unavailable. The volume, pitch, and duration of the audio alert (including the choice between a male or female voice) is configured during installation. The following TIS audio alerts are available: Traffic Advisory (TA)-This symbol is generated when traffic meets the advisory criteria described in TIS Operational Proce- dures. Own Aircraft Traffic Ground Track is indicated on the 400W/500W display by a "target track vector", a short line displayed in 45-degree increments. This vector shows the flight direc- tion of the traffic. "Other" Traffic-This symbol represents traffic detected within the selected display range that does not generate a TA. • "Traffic" -TIS traffic alert is received. • "Traffic Not Available" - TIS service is not available or out of range. 4 190-00356-30 Rev H