Craig -- Sorry it seems I put this on my queue and didn't see it until today, my first day back in the office after a week at conferences.

ACP has no clue about park positions. It just calls a standard Park() function in the mount control system and waits until the mount says it has finished parking. You can test this by using ACP's Park... option in its Telescope menu. This calls the same logic as the Park() command in a script. Find out how to set the APCC/AP park position so that this command in ACP worls as expected.

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