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My experience has been good with a 530/430 (non WAAS) to the ARC unit, although I also have a Flight Director. In NAV mode, it will follow the magenta line quite nicely and even the turns are not bad as the Garmin unit does use anticipation which if I recall correctly is programable anyway in the Garmin. Than with LOC mode armed, when LOC is sensed, it switches to that and with GS armed, when intercepted, the glide slope is also followed.
Works pretty well, but that said I almost always hand fly the approaches for the practice and monitor the entire approach when coupled.
There was a requirement for an adapter box or two so the Garmins would talk to everything as I recall, but that was the top and tail of it.
Peter has seen my set-up so may also be able to comment further.
Regards - Dave
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