Garmin GTX 330 GPS Receiver User Manual


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3
TIS Operation and Symbology
Part One: Section 1
andavoid.”Someofthemorecommonexamplesof
these errors follow:
• Whenclientorintruderaircraftmaneuversexces-
sively or abruptly, thetrackingalgorithm may
reportincorrecthorizontalposition until the
maneuveringaircraftstabilizes.
• When a rapidly closing intruder is on a course that
crosses the client aircraft course at a shallow angle
(eitherovertakingorheadon)andeitheraircraft
abruptly changes course within ¼ NM, TIS may
display the intruder on the opposite side of the
client than it actually is.
These are relatively rare occurrences and will
be corrected in a few radar scans once the course
has stabilized.
Improving TIS
UsersofTIScanrendervaluableassistancein
the correction of malfunctions by reporting their
observationsofundesirableperformance.Reporters
should identify the time of observation, location, type
and identity of aircraft, and describe the condition
observed; the type of transponder processor and soft-
ware in use can also be useful information. Since TIS
performance is monitored by maintenance personnel
other than ATC, it is suggested that malfunctions be
reported in the following ways:
• BytelephonetothenearestFlightServiceStation
(FSS)facility.
• ByFAAForm8000-7,SafetyImprovementReport,
a postage-paid card designed for this purpose.
ThesecardsmaybeobtainedatFAAFSSs,General
AviationDistrictOfces,FlightStandardsDistrict
Ofces,andGeneralAviationFixedBasedOpera-
tions.
TIS Symbology
TIStrafcisdisplayedonthe400W/500WSeries
unit according to TCAS symbology, graphically dis-
played on a dedicated graphical page (Traffic Page;
see below), and on the moving Map Page. A Traffic
Advisory (TA) symbol appears as a solid yellow circle
(or half circle on the outer range ring if the traffic is
outsidetherangeofthededicatedTrafcPage).Prox-
imity Advisories (PA) are displayed as a solid diamond,
and other traffic is displayed as an open diamond. PA
and other traffic is normally displayed in white, or it
may be alternatively configured for display in cyan.
When configured for cyan, the traffic page range rings
andmarkingsaredisplayedinwhite.Altitudedevia-
tion from own aircraft altitude is displayed above the
target symbol if traffic is above own aircraft altitude,
and below the symbol if they are below own aircraft
altitude. Altitude trend is displayed as an up arrow
(>+500ft/min),downarrow(<-500ft/min),orno
symboliflessthan500ft/minrateineitherdirection.
•TrafcAdvisories(TA)—Yellow
•ProximityAdvisories(PA)—White
(may be configured as Cyan)
•Other—White(maybeconguredasCyan)
190-00356-30 Rev F
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