Page 6-10 GTN 625/635/650 TSO Installation ManualRev. C 190-01004-026.6.5 Main Indicator (Analog) Configuration PageAccess the Main Indicator (Analog)Configuration page, as shown in Figure 6-8, bytouching the ‗Main Indicator (Analog)‘ key onthe GTN Setup page. This page allows you tocalibrate the OBS resolver, enable the CDI key,selected course for GPS and/or VOR/LOC, andconfigure the V-Flag state. The following fieldscan be configured:CALIBRATE OBS RESOLVERTo calibrate the OBS resolver, touch the‗Calibrate‘ key from the Main CDI Configurationpage. Next, select 150˚ on the OBS, then touchthe ‗OK‘ key, as prompted on the display. Afterthe OBS resolver is finished calibrating, the GTNwill display ‗OBS Resolver CalibrationComplete‘. Touch ‗OK‘ after the calibration iscomplete. Verify OBS operation by checking thatthe course displayed on the GTN is within 2° ofthe selected course.CDI KEYIf it is desired to disable the CDI key, touch the key to the right of ‗CDI Key‘ to toggle between enablingand disabling the CDI key. Disabling the CDI key removes the CDI key from the screen and sets theCDI/VDI outputs always to GPS. This may be necessary for certain EFIS systems where navigationsensor selection must be accomplished on the EFIS or its control panel.SELECTED COURSE FOR GPSIf it is desired to ignore a selected course input for GPS operation in OBS mode, touch the key to the rightof ‗Selected Course for GPS‘ until ‗Ignored‘ is displayed on the key.SELECTED COURSE FOR VOR/LOCIf it is desired to ignore a selected course input such that the VOR valid flag is dependent only on a validVOR signal, with lateral deviation calculated by another display device, touch the key to the right of‗Selected Course for VLOC‘ until ‗Ignored‘ is displayed on the key.V-FLAG STATESelect either Normal or Declutter for the V-Flag State by touching the key until the desired selection isdisplayed on the key.Selection DescriptionDeclutterWhenever vertical deviation is invalid, the vertical deviation bar isparked in the maximum UP position and the vertical flag is removedfrom view, except in the following cases: (i) the CDI is in VLOC modeand an ILS frequency is tuned, or (ii) the CDI is in GPS mode and aGPS approach with vertical guidance is active. In these cases,whenever the vertical deviation is invalid, the vertical deviation barparks in the centered position and the vertical flag is shown.Normal Whenever vertical deviation is invalid the vertical deviation bar parks inthe centered position and the vertical flag is shown.Figure 6-8. Main Indicator (Analog)Configuration Page
