I think it may have to do with the Western GoTo Limit. Like Jasem said the software causes a meridian flip by issuing a goto with the same coordinates. What I think is happening is that if the mount has not crossed (or gotten close to) the Western GoTo Limit then the mount won't flip. I do not have a complete understanding of exactly how this setting works but if you haven't you should join the Gemini Yahoo group. There are many Gemini experts on that group that could explain the settings much better than I can.

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