Gdc 74B Field Calibration Utility, Main Page; Serial Port Pull-Down List - Garmin G1000 Maintenance Manual

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Figure 5-28. GDC 74B Field Calibration Utility, Main Page
8. Select the Serial Port on the PC that will be used to communicate with the GDC 74B and
click 'OK'.
9. After communication with the GDC 74B is established, the 'Full Backup' screen appears
while a full backup of the original unit setting is saved to a file named
BKUP_(serial_num)_YYYYMMDD_ HHMMSS.txt. This file can be used (by Garmin) to
restore the unit to the original settings if necessary.
10. After the full backup file has been created, the 'Prepare To Take Measurements' screen is
displayed while the program retrieves the unit type from the GDC 74B.
11. After the unit type has been determined, the 'Set altitude to 0 ft' screen (Figure 5-36)
appears.
12. Set the pressure control system to a pressure altitude of 0 feet according to the on-screen
instructions.
13. Allow the on-screen altitude reading to stabilize, then click 'OK'.
14. After the 0 feet calibration is complete, the 'Set altitude to 11,000 ft' screen is displayed.
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Rev. A
Figure 5-29. Serial Port Pull-Down List
G1000 System Maintenance Manual
190-00903-00