Garmin PDAs & Smartphones G1000 Manual De Usuario

190-00498-07  Rev. A

603

Aircraft without an operating transponder are invisible to TIS.

The Traffic Information Service (TIS) provides traffic advisory information to non-TAS/TCAS-equipped 

aircraft.  TIS is a ground-based service providing the relative locations of all ATCRBS Mode-A and Mode-C 
transponder equipped aircraft within a specified service volume.  The TIS ground sensor uses real-time track 
reports to generate traffic notification.  The G1000 System displays TIS traffic information on the Traffic Map 
Page of the MFD.  TIS information may also be displayed for overlay on the MFD Navigation Map Page, as 
well as on the PFD Inset Map.  Surveillance data includes all transponder-equipped aircraft within the coverage 
volume.  The G1000 System displays up to eight traffic targets within a 7.5 nm radius, from 3,000 feet below, 
to 3,500 feet above the requesting aircraft.

The Traffic Information System (TIS) is a ground-based service that requires contact with a ground station 

through a datalink radio in order to receive traffic information.  Traffic Advisory (TAS) and Traffic Collision 
Avoidance Systems (TCAS) are self-contained.  TAS/TCAS uses an airborne interrogator with a half-second 
update rate, while TIS utilizes the terminal Mode-S ground interrogator and accompanying data link to provide 
a five-second update rate.  TIS and TAS/TCAS have similar ranges.

TIS is not intended to be used as a collision avoidance system and does not relieve the pilot of the 

responsibility to “see and avoid” other aircraft.  TIS shall not be used for avoidance maneuvers during 
instrument meteorological conditions (IMC) or when there is no visual contact with the intruder aircraft.

Refer to the TIS Limitations section of the Aeronautical Information Manual (AIM) for a more 

comprehensive explanation.

TIS relies on surveillance of the Mode-S radar system, which is a “secondary surveillance” radar system 

similar to that used by ATCRBS.  Many limitations are inherent in secondary radar surveillance.  Information 
provided by TIS is neither better nor more accurate than the information used by ATC.  TIS is intended only 
to assist in visual acquisition of other aircraft in visual meteorological conditions (VMC).  While TIS is a useful 
aid for visual traffic avoidance, system limitations must be considered to ensure proper use.  No recommended 
avoidance maneuvers are given, nor authorized, as a direct result of a TIS intruder display or TIS advisory.

• TIS operation may be intermittent during turns or other maneuvering.

• TIS  is  dependent  on  two-way,  line-of-sight  communications  between  the  aircraft  and  the  Mode-S  radar

antenna.  Whenever the structure of the aircraft comes between the transponder antenna and the ground-
based radar antenna, the signal may be temporarily interrupted.

• Other limitations and anomalies associated with TIS are described in the AIM.