Garmin Appliance Data User's Guide Page 9

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3
TIS Operation and Symbology
Part One: Section 1
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 software 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 Offices, Flight Standards District
Offices, and General Aviation Fixed Based Opera-
tions.
TIS Symbology
TIS traffic is displayed on the 400W/500W Series unit
according to TCAS symbology, graphically displayed 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
Traffic Page). Proximity 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
deviation 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.
• Traffic Advisories (TA)—Yellow
• Proximity Advisories (PA)—White
(may be configured as Cyan)
• Other—White (may be configured as Cyan)
190-00356-30 Rev L
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