9-4
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Traffic
9.3.1
TIS Symbology
Traffic is displayed according to TCAS symbology using three different
symbols.
TIS Symbol
Description
Non-Threat Traffic
Traffic Advisory (TA)
Traffic Advisory Off Scale
Table 9-1 TIS Traffic Symbols
Traffic Advisories (TA) alert the crew to intruding aircraft. When traffic meets
the advisory criteria for the TA, a solid yellow circle symbol is generated. A
Non-threat Advisory, shown as an open white diamond, indicates that an
intruding aircraft is at greater than ±1200 feet relative altitude or the distance is
beyond five NM. A Traffic Advisory that is beyond the selected display range is
indicated by a half TA symbol at the edge of the screen at the relative bearing of
the intruder.
TIS also provides a vector line showing the direction in which the traffic
is moving, to the nearest 45°. Traffic information for which TIS is unable to
determine the bearing (non-bearing traffic) is displayed in the center of the
Traffic page or in a banner on maps other than the Traffic Map page on which
traffic can be displayed.
The altitude difference between the requesting aircraft and other intruder
aircraft is displayed above/below the traffic symbol in hundreds of feet. If the
other aircraft is above the requesting aircraft, the altitude separation appears
above the traffic symbol with a "+" sign; if below, the altitude separation appears
below. Altitude trend is displayed as an up/down arrow (for speeds greater than
500 fpm in either direction) to the right of the target symbol. Traffic symbols for
aircraft without altitude reporting capability appear without altitude separation
or climb/descent information.
Always remember that TIS cannot alert you to the presence of aircraft that
are not equipped with transponders, nor can it alert you to aircraft that may be
nearby, but obscured from the ground surveillance radar by interfering terrain.
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