This tip only applies to GT scopes with the "original" hand control. NexStar GT scopes purchased since January 2002 do NOT generally have the "original" GT hand control.
The Third Star Align feature on the original GT NexStars is reported to be nonfunctional, but actually it does work. The problem is that the instructions in the manual are incorrect or at least difficult to follow for the original GT hand control. The feature allows you to replace one of your two current alignment stars with any of the 40 alignment stars in the Named Stars list. This can help to improve accuracy in the area of the new alignment star.
Here is the correct procedure for the original GT hand control:
Sounds tough, but after you do it a few times it will be second nature.