Garmin GDL 88 Series Pilots Guide - Page 22

Traffic

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4.2 Traffic The GDL 84/88 receives traffic from several sources including external sources (ADS-B, ADS-R, and TIS-B). Additionally, in the GDL 88, onboard sources (TAS/ TCAS) create a single, fused traffic picture for the flight crew. Using relative altitude, relative bearing, range, directionality, ground track, and other identifying information (ICAO address, flight ID, call sign, tail number), the GDL 84/88 determines when tracks from multiple sources represent a single traffic target, selects the most accurate position source for the target, and sends the data to the display. NOTE: The GDL 84/88 observes all ADS-B participants within range. However, due to the nature of TIS-B's service volumes and the incomplete equipage/ adoption of ADS-B Out equipment, NOT ALL TRAFFIC IS OBSERVED by the GDL 84/88. The flight crew must rely on "see and avoid" procedures to detect and avoid traffic. In addition, when operating on the edges of ATC radar coverage or when using an interfaced active traffic system and TAS/TCAS targets are intermittent, it is possible that a single target aircraft may be briefly or periodically depicted as two grouped targets in the same location. 4.2.1 Traffic Applications - SURF, AIRB, etc When the GDL 88 is interfaced to a certified compatible display unit, a traffic display is available for the flight crew's situational awareness and to enhance the visual acquisition of surrounding traffic. The GNS 400W/500W units do not support all applications, including SURF. The exact location of the ownship as shown by the ownship symbol on the moving map varies by the display device. For GTN units, the tip of the ownship icon, or where the dot is, identifies the exact location. For GNS units, the exact location of the ownship is the center of the ownship icon where the wings cross the fuselage. This display is capable of running in two "modes:" Airborne Situational Awareness (AIRB) and Surface Situation Awareness (SURF). AIRB is in operation in the en route environment, outside of five NM from and 1,500 feet above the nearest airport. 4-2 Garmin GDL 84/88 ADS-B Transceiver Pilot's Guide 190-01122-03 Rev. E

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4-2
Garmin GDL 84/88 ADS-B Transceiver Pilot’s Guide
190-01122-03
Rev. E
4.2
Traffic
The GDL 84/88 receives traffic from several sources including external sources
(ADS-B, ADS-R, and TIS-B). Additionally, in the GDL 88, onboard sources (TAS/
TCAS) create a single, fused traffic picture for the flight crew. Using relative
altitude, relative bearing, range, directionality, ground track, and other identifying
information (ICAO address, flight ID, call sign, tail number), the GDL 84/88
determines when tracks from multiple sources represent a single traffic target,
selects the most accurate position source for the target, and sends the data to the
display.
NOTE
:
The GDL 84/88 observes all ADS-B participants within range. However,
due to the nature of TIS-B’s service volumes and the incomplete equipage/
adoption of ADS-B Out equipment, NOT ALL TRAFFIC IS OBSERVED by the
GDL 84/88. The flight crew must rely on “see and avoid” procedures to detect
and avoid traffic. In addition, when operating on the edges of ATC radar
coverage or when using an interfaced active traffic system and TAS/TCAS
targets are intermittent, it is possible that a single target aircraft may be
briefly or periodically depicted as two grouped targets in the same location.
4.2.1
Traffic Applications – SURF, AIRB, etc
When the GDL 88 is interfaced to a certified compatible display unit, a traffic
display is available for the flight crew’s situational awareness and to enhance the
visual acquisition of surrounding traffic. The GNS 400W/500W units do not
support all applications, including SURF.
The exact location of the ownship as shown by the ownship symbol on the
moving map varies by the display device. For GTN units, the tip of the ownship
icon, or where the dot is, identifies the exact location. For GNS units, the exact
location of the ownship is the center of the ownship icon where the wings cross
the fuselage.
This display is capable of running in two “modes:” Airborne Situational
Awareness (AIRB) and Surface Situation Awareness (SURF).
AIRB is in operation in the en route environment, outside of five NM from and
1,500 feet above the nearest airport.