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S. Wilson replied to the topic 'GPSS Benefits?' in the forum. 2 days ago

Great explanation and thank you very much. The summary then is that the GPSS expertly controls the heading bug inputs to the autopilot in HDG mode.

The challenge for me is that I just do not see the performance degradation when the autopilot is in NAV mode and turning the plane, such as throughout a course reversal or hold. Maybe a better way to explain is that neither mode perfectly tracks a course reversal as they both seem to veer a little outside the desired track but ultimately find their way to the final course. Maybe I expect too much.

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Jose Lopezdelpuerto replied to the topic 'GPSS Benefits?' in the forum. 2 days ago

There is no difference flying straight. GPSS is for turning. Here is an explanation:
aviation.stackexchange.com/questions/215...utopilot/44188#44188

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S. Wilson created a new topic ' GPSS Benefits?' in the forum. 2 days ago

My 182 has two Garmin 430Ws, STEC 60-2 autopilot with auto trim, and Aspen PFD Pro with GPSS. I fly transition RNAV approaches with the 60-2 in HDG and ALT modes and the Aspen in GPSS. When established on final I switch the 60-2 to NAV mode well outside the FAF to arm glideslope capture. However, the setup is equally effective at flying a transition approach if I just leave the 60-2 in NAV and ALT modes and then tap NAV again well outside the FAF to arm capture. Is there supposed to be a performance or accuracy difference between these two arrangements?

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Larry Hofmeister shared a photo. 3 days ago
Larry Hofmeister shared a photo. 3 days ago

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