8-1190-01122-03 Rev. C Garmin GDL 88 ADS-B Transceiver Pilot’s Guide8 APPENDIX8.1 TroubleshootingIf efforts to resolve the problem fail, contact your dealer or customer servicefor technical assistance.Please have the following information ready:• System configuration (products, antennas, mounting locations, etc.)• Model No., part number, and serial number• Software versions• Description of the problem• Efforts made to isolate/solve the problemGarmin International, Inc.Aviation Products Customer Service Department1200 East 151st StreetOlathe, KS 66062-3426 USA1-866-739-5687https://fly.garmin.com/fly-garminExternal ADS-B AnnunciatorWhen one or more GDL 88 faults are present, the ADS-B annunciator activatesone or both of two lights to indicate the presence and type of the highest priorityGDL 88 fault present. For example, if both a No Position (priority 2) fault and aFault (priority 3) are present, the ADS-B annunciator will indicate the presenceof a No Position fault.Figure 8-1 GDL 88 Annunciator