Ah, very interesting. Thanks Andy. I first was alerted to this possibly being a problem when I left my AstroTrac running unattended and SGP was shut down when I returned. The only thing I could see from the PHD graph that might have caused it was that the Dec line had drifted quite a bit over the hour or so it was running (not a problem over the short duration of the light exposure, but over multiple exposures if you don't have a dead accurate polar alignment there is bound to be Dec drift).
Thanks for bringing this to the attention of the developers group, as it doesn't really make sense to allow Dec position to affect settling on a mount that doesn't guide in Dec. It would seem reasonable that when Dec guiding is turned off in PHD to just use RA deviation for settling.
As is I'm not sure what to do, as getting my polar alignment so perfect that there is no drift in Dec over the 2h run of the AstroTrac would be pretty daunting. I don't seem to have a choice in SGP to turn off settling.
I'm leaving on a trip on Monday to California for a week and I'm planning to take my portable imaging setup. I'm worried that this issue is going to cut short my imaging. Can you think of any work around that would bypass this problem, Andy?
thanks again,
Keith