Garmin G1000 NAV III Line Maintenance Manual page 226

B.1.5.4 GRS 77 AHRS Software (GDU software version 6.01 and earlier)
1. Highlight the GRS77 file. Ensure that the GRS to GIA data path 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 GRS 77 AHRS 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'.
Page B-12
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G1000 Nav III Line Maintenance Manual
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