GNS 400W/500W Series units with software version 5.00 to 5.30 interfaced to a Garmin GDL 88 that is interfaced to an Avidyne (Ryan) TAS 6XX (9900BX) are affected.
When enabling or disabling TCAD APR Mode on the GNS Traffic page, the selection does not display “Disable TCAD APR Mode?”. The selection always displays “Enable TCAD APR Mode?”.
Use the GNS Traffic page to make sure which TCAD mode is selected. The TCAD mode is displayed in the upper right corner of the GNS Traffic page.