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Meridian Flip
MMm, the dark secret of the GEM - the Sphinx knows about this too, puts up a warning and offers to reverse direction for you or you can override (or ignore) then it lets you continue for about 30 mins past 12 but then it goes into a nodding pattern.
Sometimes the automatic reversal is not correct and the slew has to be stopped. If this happens I pick a target on the other side of the meridian and slew to that - adjust the balance, check alignment and the go back to tthe target I was on when it is clear of the 30 mins window. Of course the target is now the other way up in your fov - and if you were autoguiding you will need to reverse correction directions (or better re-calibrate).
Best to avoid this if you can.
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