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I have a 1978 Lance (PA32RT-300T) with Aspen E5, Garmin 530W and Century III Autopilot (the same as an Altimatic IIIC). ILS or RNAV WAAS works...
If you have a glide slope coupler and when using GPSS and have the approach loaded, once established on the localizer, (the auto pilot should be...