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This is my first contribution/question to this forum so I hope I am using the
correct address and format.  

My concern is that in most of the planes that I have flown the autopilot
regardless of cost was little more than a wing leveler.  It constantly
searched for the course and hunted left or right with little systematic
purpose.  I am told that if there is an HSI that is coupled between the GPS
and the auto pilot that my expectations of a precise course can be flown.  

Does anyone have an autopilot system that really holds the course and flight
plan that is error sourced to the GPS?  Most seem to work well when holding a
course set  by the DG, so maybe an HSI is an integral part.  

Appreciate your comments and suggestions.  Lancair IV, Walters Turbine 651