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Paul's suggestion is spot on, you illuminate the polar scope to get the Octans reticule pattern rotated into the correct orientation, then no illumination while you find the pattern of stars in the scope and then illuminate on and off as needed as you lock the reticule pattern over the stars.
It's quite straightforward after a bit of practice, key thing is to know what orientation the Octans pattern will be in remembering its going to show upside down in the polar scope so you know what to look for.
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