Garmin GPSMAP 800 Series, Pilot'S Manual Addendum

1.2  TRAffIC SyMBOlOGy

Traffic information from the GTS 8XX is displayed on the 4XX/5XX unit using TAS/

TCAS symbology (Table 1) on a dedicated Traffic page, and on the moving Map Page.  
The displayed traffic information generally includes the relative range, bearing, and 
altitude of intruder aircraft.  The GTS 8XX also generates aural announcements heard 
on the cockpit audio system.  Proximity Advisories and Other Traffic symbols normally 
displayed in white may be displayed in cyan if configured for alternate traffic color (see 
the applicable 4XX/5XX installation manual).

Symbol Traffic Type

Description

Traffic 
Advisory (TA)

A TA (Traffic Advisory) is generated when the GTS 8XX 
predicts that an intruder aircraft may pose a collision 
threat.  A solid yellow circle represents an intruder aircraft 
that meets the TA criteria as described in the TA Alerting 
Conditions section.  A TA consists of the traffic symbol and 
an aural alert (e.g., “traffic, 12 o’clock, high, 3 miles”).

Out-of-
Range Traffic 
Advisory

This solid yellow half circle appears (on the outer range ring) 
under the same conditions and has the same urgency as a 
TA.  Its appearance differs from the TA only to signify that 
the intruder is outside of the current range of the Traffic 
Page.

Proximity 
Advisory (PA)

Proximity Advisories (PA) are displayed as solid white (may 
be configured as cyan) diamonds.  PAs are defined as 
traffic within the 6.0-nm range, within ±1200 ft. of altitude 
separation, and are not a traffic advisory (TA).

Other Traffic 
Symbol

The hollow white (may be configured as cyan) diamond 
represents traffic detected within the selected display range 
that does not meet the criteria for a TA or a PA and does 
not pose an immediate collision threat.

Table 1  TAS/TCAS Symbology

1.3  TA AleRTING CONDITIONS

The  GTS  8XX  automatically  adjusts  its  TA  sensitivity  level    (Table  2)  to  reduce 

the likelihood of nuisance TA alerting during flight phases likely to be near airports.  
Level A (less sensitivity) TA sensitivity is used when the aircraft’s radar altimeter (if 

400/500 Pilot’s Guide Addendum for GTS 8XX Interface

190-00140-78  Rev. A 

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GTS 8XX Interface