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It doesn't matter if there is differences in reading from inside and outside, it is about familiarising with and testing the whole system, and it can be done in daylight as well.
I would recommend to you (and any other begginer) not to rely on technology too much - it is distraction from enjoyment of clear skies (unless technology is your thing... ). Also, it is not needed for good understanding of celestial geometry (astrometry) anyway..
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