SpaceDust wrote: DrWho,
The description of your problem matches exactly mine.
In my case it was the longitude that was wrong. The hemisphere obviously also needs to be the correct, and lastly the hour.
I suggest you have it gathering the hour from the system to troubleshoot, but ideally you would get coordinates and time from the GPS.
The key aspect is that if the time or longitude are wrong the calculated Zenith is pointing on the wrong direction.

One more critical aspect.
My DEC always starts with a full rotation Eastwards, regardless where the target is. I don’t know why, but it does once at the begging of a session IF I didn’t park at the end of the previous session. If I park it, it never does that full rotation. If I don’t park it, it always starts with a full rotation (once I start slewing)

Give it a try. Apart from these little tricks, I super pleased with the portability of the RPi.

Tried again tonight. Took scope of mount and tried to see what would happen if I didnt abort go to. I selected Andromeda. It got there eventually but only after going all around the houses on the dec axis as you described i.e. it went pretty much 360 degrees. when I park the mount it then slews all the way back. Obviously, this is an impractical situation. I cannot take the scope off to slew to target all of the time.
What I do not understand is the software knows where thev target is and where the scope is supposed to be going. It will get it there, but only by going the wrong way around. This makes it unusable at the moment. Logs attached again.
WRT PAC I cannot find a way to turn off in the mount drive unit.

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