10-12Garmin GTN 725/750 Pilot’s Guide 190-01007-03 Rev. DForewordGettingStartedAudio &Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafflcTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.4 TAS Traffic (Optional)NOTE: TIS and Traffic Advisory System (TAS) may not both be configuredat the same time.TAS data comes from a TAS unit such as a Garmin GTS 800 or 820, Skywatch497, KTA 810, or other unit.Refer to the appropriate Traffic Advisory System’s Pilot’s Guides for a detaileddiscussion of the respective traffic advisory system.The type of traffic systems that is installed is described by the Traffic Pagekeys. If a Traffic Advisory System (TAS) is configured, a Traffic Mode andAltitude Filter key will be displayed.NOTE: Pilots should be aware of TAS system limitations. TAS systemsrequire transponders of other aircraft to respond to system interrogations.If the transponders do not respond to interrogations due to phenomenasuch as antenna shading or marginal transponder performance, traffic maybe displayed intermittently, or not at all. Aircraft without altitude reportingcapability are shown without altitude separation data or climb descentindication. Pilots should remain vigilant for traffic at all times.WARNING: The Traffic Advisory System (TAS) is intended for advisory useonly to aid the pilot in visually acquiring traffic. No avoidance maneuversshould be based solely upon TAS traffic information. It is the responsibilityof the pilot in command to see and maneuver to avoid traffic.A Traffic Advisory System (TAS) enhances flight crew situational awarenessby displaying traffic information for transponder-equipped aircraft. The TASalso provides visual and aural traffic alerts including voice announcements toassist in visually acquiring traffic.When the TAS is in Operating Mode, the unit interrogates the transpondersof intruding aircraft while monitoring transponder replies. The TAS uses thisinformation to derive the distance, relative bearing, and if reported, the altitudeand vertical trend for each aircraft within its surveillance range. The TAS thencalculates a closure rate to each intruder based on the projected Closest Point ofApproach (CPA). If the closure rate meets the threat criteria for a Traffic Advisory(TA), visual and aural alerting is provided.
