Thanks Gary,
If my suspected error was on our other GEM mount, it would be a simple matter to check, cos its got Argo Navis!
I think that you are saying that there is no manually based way of finding and adjusting or "cone errors" in the southern hemisphere.
My problem is that our SW HEQ5 (with GPS) does almost perfect 2 star alignments, with stars in the correct position all over the sky, but it wont do a successful 3 star calibration, - the third alignment star is always a long way away from its predicted position, and the alignment fails.
The incredibly minimalist Skywatcher manual (especially when compared to the "Bible according to Saint Argo") says that the difference is that the 3 star alignment takes into consideration "cone error"
Now the obvious answer is "hey - just do 2 star alignments!" but I am interested in tracking down the reason for the failed 3 star alignment process.
Regards Rider
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