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(2015) Service Advisory 1574: GTN 6XX/7XX User-Defined Waypoints
PRODUCTS AFFECTED:
Garmin GTN 6XX/7XX series units with main software version 6.01 and earlier are affected.
ISSUE:
Modifying the location of a user-defined waypoint that is part of an active flight plan may result in erroneous navigation.
PILOT ACTION:
Do not modify the location of a user-defined waypoint that is part of an active flight plan.