Garmin G1000 NAV III Line Maintenance Manual page 150

2. Enter the configuration mode by holding the ENT key on each display while applying power. Release the
ENT key when the words INITIALIZING SYSTEM are displayed on each display.
3. On the PFD, turn the FMS outer knob clockwise until the GRS Page Group is selected.
4. At the GRS Page Group, turn the inner FMS to display the GRS/GMU Calibration page.
5. The GRS/GMU Calibration page is protected and requires a keystroke password to perform the calibration.
Press the following softkeys in sequence:
i) softkey 9
ii) softkey 10
iii) softkey 11
iv) softkey 12
6. Press the FMS inner knob to highlight GRS 77 #1. The FMS inner knob can now be turned to select either
GRS 77 #1 or GRS 77 #2 for calibration. Press the ENT key after selecting the desired GRS 77 unit to
calibrate. The SELECT PROCEDURE field is now blinking.
7. Using the FMS inner knob, select MAGNETOMETER and press the ENT key. If the MAGNETOMETER
selection continues to blink, press the ENT key again.
8. Follow the checklist items displayed on the PFD and press the ENT key as each one is completed or
confirmed. When the CALIBRATE field is blinking, press the ENT key to begin the procedure.
9. The PFD advises the operator when to turn the aircraft, when to stop, and when to turn again.
10. Upon instruction to turn, taxi the aircraft in a right turn. After approximately 30° of turn from the last heading
the PFD instructs the operator to stop the aircraft.
Due to the difficulties in executing smooth, accurate turns the PFD may incorrectly interpret a
station and instruct to "HOLD POSITION" prior to full completion of a 30° turn. If this scenario
is encountered, it is best for the operator to ignore the "HOLD POSITION" command and instead
use outside references to complete the approximate 30° turn. Instead of using the PFD instruction
to turn as a real-time indication of when to turn, simply judge the 30° (±5°) turn increments of the
aircraft by using the compass rose radials. Dwelling at these 30° increments for the time
recommended by the PFD should result in successful calibration.
11. The PFD guides the operator to dwell at multiple headings around a complete circle.
Due to high winds or excessive airframe vibration, the operator may encounter a condition where
the PFD restarts the 18-second countdown without full completion of the previous countdown. If
this is encountered more than once for a given station, the operator should begin turning to the
next station (approximately 30°). A minimum of 2 successful stations per quadrant is required,
where a successful station is a full 18-second countdown followed by instruction to move.
Ensure that if stations are skipped, at least a minimum of 2 stations per quadrant are completed.
Thus, it may sometimes be required to dwell at a station after a countdown restart. A maximum
of 20 stations is allowed for the entire calibration procedure. If too many countdown restarts are
encountered, the calibration will fail with the message, "TOO MANY STATIONS."
12. Repeat the turn-and-stop process until the PFD instructs the operator that a successful calibration is complete.
13. Press the ENT key on the PFD to conclude this procedure.
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G1000 Nav III Line Maintenance Manual
190-00352-00