Gday Dave
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I guess the infinite variables between refractors vs newtonians vs Cats, plus or minus diagonals might make it a bit harder to say an upward deflection on the graph equals north or south, etc.
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All i do is release the dec lock and "manually" push the diagonal end of my scope "towards the pole". In my LX200gps, this effectively means the corrector "physically" moves "away from the pole".
This effectively simulates a star drifting "towards the pole".
ie Sth for us
I then orientate my camera such that the star "rises" on the screen when i do this.
No need to "think" which way the image is presented then.
If the star is rising on the screen, its drifting Sth and a std cheatsheet tells you which way to adjust the wedge.
Similar logic can be used with a gem.
Andrew