Garmin G1000 NAV III Line Maintenance Manual page 227

B.1.5.5 GMU 44 Magnetometer Software (GDU software version 6.01 and earlier)
1. Highlight the GMU44 file. Ensure that GMU1 appears in the LRU field as shown:
2. Press the LOAD softkey.
3. Select YES and press the ENT key to acknowledge the following prompt:
4. The software for the GMU 44 Magnetometer begins to load. Monitor the upload status as it progresses:
5. After the files finish loading, press the ENT key to acknowledge the following prompt:
6. Check the SUMMARY field to ensure the load is 'COMPLETE'.
G1000 Nav III Line Maintenance Manual
190-00352-00
Page B-13
Rev. L