Pilot's Guide
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APPENDIX F: GENERAL TIS INFORMATION<br />
190-01194-00 Rev. A<br />
Garmin aera 795/796 Pilot’s <strong>Guide</strong><br />
Appendix F<br />
NOTE: Aircraft without an operational transponder are invisible to TIS.<br />
NOTE: TIS is not intended to be used as a collision avoidance system and does<br />
not relieve the pilot of the responsibility to “see and avoid” other aircraft. TIS<br />
should not be used for avoidance maneuvers during instrument meteorological<br />
conditions (IMC) or when there is no visual contact with the intruder aircraft.<br />
The Traffic Information Service (TIS) provides traffic advisory information to non-<br />
TAS/TCAS-equipped aircraft. TIS is a ground-based service providing the relative<br />
locations of all ATCRBS (Air Traffic Control Radar Beacon System) Mode-A and Mode-C<br />
transponder equipped aircraft within a specified service volume. The TIS ground<br />
sensor uses real-time track reports to generate traffic notification. The aera 795/796<br />
displays TIS traffic information on the Navigation Map. Surveillance data includes all<br />
transponder-equipped aircraft within the coverage volume. The aera 795/796 displays<br />
up to eight traffic targets within a 7.5-nm radius, from 3,000 feet below, to 3,500 feet<br />
above the requesting aircraft.<br />
TIS VS. TAS/TCAS<br />
The main difference between the Traffic Information System (TIS) and Traffic Advisory<br />
(TAS) or Traffic Collision Avoidance Systems (TCAS) is the source of surveillance<br />
data. TAS/TCAS uses an airborne interrogator with a half-second update rate, while<br />
TIS utilizes the terminal Mode-S ground interrogator and accompanying data link to<br />
provide a five-second update rate. TIS and TAS/TCAS have similar ranges.<br />
TIS LIMITATIONS<br />
TIS relies on surveillance of the Mode-S radar system, which is a “secondary<br />
surveillance” radar system similar to that used by ATCRBS. Many limitations are<br />
inherent in secondary radar surveillance. Information provided by TIS is neither better<br />
nor more accurate than the information used by ATC. TIS is intended only to assist in<br />
visual acquisition of other aircraft in visual meteorological conditions (VMC). While<br />
TIS is a useful aid for visual traffic avoidance, system limitations must be considered to<br />
ensure proper use. No recommended avoidance maneuvers are given, nor authorized,<br />
as a direct result of a TIS intruder display or TIS advisory.<br />
153<br />
Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices Index