Traffic Surveillance Volume

The TAS/TCAS I system monitors the airspace within ±10,000 feet of own altitude, and up to 40 NM in the forward direction. Traffic system range is somewhat reduced to the sides and aft of own aircraft due to the directional interrogation signal patterns. In areas of greater transponder traffic density, the on-board traffic system automatically reduces its interrogation transmitter power (and therefore range) in order to limit potential interference from other signals.

NOTICE

Do not confuse this functionality with full ADS-B capability, which can provide traffic information from ADS-B Ground-Based Transceivers (GBTs) and ADS-B traffic outside of the TAS/TCAS I surveillance volume.

When the traffic system is paired with a system compatible GTX transponder (optional), the traffic system also uses Automatic Dependent Surveillance - Broadcast (ADS-B) position reports from participating aircraft to enhance the positional accuracy of traffic displayed within the TAS/TCAS I surveillance range, in addition to broadcasts from traffic outside of the TAS/TCAS I surveillance range. It also receives information from ADS-B Ground Based Transceivers (GBTs). This includes the Traffic Information Service-Broadcast (TIS-B) service and Automatic Dependent Surveillance-Rebroadcast (ADS-R) service; refer to the Automatic Dependent Surveillance-Broadcast (ADS-B) Traffic section for more information about these features.

NOTICE

The Garmin traffic system does not display traffic determined to be on the ground, including Mode C transponder equipped aircraft operating below 300’ AGL that is not climbing. However, if own aircraft has ADS-B In capability, and is receiving traffic information from an ADS-B source (including ADS-R, ADS-B, TIS-B), the system does display this traffic while operating in SURF Mode. Refer to the Automatic Dependent Surveillance-Broadcast (ADS-B) Traffic Section for more information.

190-03123-01 Rev B
July 2026