Garmin G1000H Marine Radio User Manual


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Garmin G1000H
™
Pilot’s Guide for the Bell 407GX
190-01255-00 Rev. B358
HAZARD AVOIDANCE
6.5 GARMIN GTS TRAFFIC
WARNING: The Garmin GTS 800 Traffic Advisory System (TAS) is intended for advisory use only to aid
the pilot in visually acquiring traffic. No avoidance maneuvers should be based solely upon TAS traffic
information. It is the responsibility of the pilot in command to see and maneuver to avoid traffic.
NOTE: Pilots should be aware of TAS system limitations. TAS systems require transponders of other aircraft
to respond to system interrogations. If the transponders do not respond to interrogations due phenomena
such as antenna shading or marginal transponder performance, traffic may be displayed intermittently, or
not at all. Aircraft without altitude reporting capability are shown without altitude separation data or climb
descent indication. Pilots should remain vigilant for traffic at all times.
NOTE: Radar altimeter data is optional for the Traffic Advisory System (TAS). If radar altimeter data is
detected by the TAS at the beginning of a power cycle and that data is subsequently lost, the TAS will
declare a fault and will not provide traffic information.
NOTE: TIS is disabled when TAS is installed.
TheGarminGTS800TrafcAdvisorySystem(TAS)enhancesightcrewsituationalawarenessbydisplaying
trafc informationfor transponder-equippedaircraft. Thesystem also providesvisual and auraltrafc alerts
includingvoiceannouncementstoassistinvisuallyacquiringtrafc.
Thesystemiscapableoftrackingupto45intrudingaircraftequippedwithModeAorCtransponders,andup
to30intrudersequippedwithModeStransponders.Amaximumof30aircraftwiththehighestthreatpotential
canbedisplayedsimultaneously.Notrafcsurveillanceisprovidedforaircraftwithoutoperatingtransponders.
THEORY OF OPERATION
WhenthetrafcsystemisinOperatingMode,theunitinterrogatesthetranspondersofintrudingaircraft
whilemonitoringtransponderreplies.Thesystemusesthisinformationtoderivethedistance,relativebearing,
and if reported, the altitude and vertical trend for each aircraft within its surveillance range. The traffic system
thencalculatesaclosureratetoeachintruderbasedontheprojectedClosestPointofApproach(CPA).Ifthe
closureratemeetsthethreatcriteriaforaTrafcAdvisory(TA),visualandauralalertingisprovided.
TAS SURVEILLANCE VOLUME
TheGTS800surveillancesystemmonitorstheairspacewithin±10,000feetofownaltitude.Underideal
conditions,theGTS800unitscanstranspondertrafcupto12nmintheforwarddirection.Therangeis
somewhatreducedtothesidesandaftofownaircraftduetothedirectionalinterrogationsignalpatterns.In
areasofgreatertranspondertrafcdensityorwhenTCASII(TrafcAlertandCollisionAvoidanceSystemII)
systemsaredetected,theGTS800automaticallyreducesitsinterrogationtransmitterpower(andtherefore
range)inordertolimitpotentialinterferencefromothersignals.
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