Garmin GDL 88 用户手册

6-2

GDL 88 ADS-B Transceiver Pilot’s Guide

190-01122-03  Rev. A

Traffic  alert  audio  output  is  interfaced  to  a  required  audio  panel  with  a

compatible unswitched unmuted audio input. 

The GDL 88 requires the use of an ownship pressure altitude for transmission

of required ADS-B Out data values and to calculate the vertical separation and
vertical closure from target aircraft. 

The GDL 88 will interface with the GTS 800, 820, and 850, Skywatch, 

Skywatch HP, and Ryan TCAD.

The GDL 88 can optionally use heading for the purpose of correlating ADS-B 

traffic and traffic received from the external traffic system. HSDB and ARINC 429
digital heading is provided to the GDL 88 from any compatible magnetic heading 
source. Multiple heading sources may be connected to the GDL 88. 

The GDL 88 uses the ownship GPS position for creation of the ADS-B Out 

messages as well as the receipt and tracking of ADS-B In targets. The GDL 88
without the internal GPS WAAS requires at least one compatible GPS position
source be installed, while the GDL 88 with the internal GPS WAAS engine may 
optionally be interfaced with compatible sources. 

The GDL 88 can optionally be interfaced with a radar altimeter to drive the 

sensitivity level of the Conflict Situational Awareness (CSA) application. 

The GDL 88 can optionally interface with a pilot controlled switch to 

acknowledge an active Conflict Situational Awareness (CSA) alert and mute the 
associated aural alert. This momentary switch only mutes the current CSAs and 
does not act as an inhibit for future CSA aural annunciations.