Geoff,
I have:
The webcam connected to the PC using guide dog.
The PC connected to the GM-8 using the RS232 connection.
Guide Dog connected to the telescope such that it can make corrections.
So, I'm not using the guide port of the GM-8, only the RS232 (PC serial) interface.
I haven't used it for a couple of months, but last I used it I was having really good success with very close to the default settings if I remember right.
Hope that helps.
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