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Briefly, it is a dedicated hand-held computer that is connected to your telescope by encoding cables that measure how far you move the scope in RA and Dec (or altitude and azimuth). It then tells you how far you need to move the telescope in each direction to have it pointing to a celestial object that you have previously selected from its extensive onboard database (which you can edit). It is a PUSH TO system, as opposed to a GOTO system.
Hope that helps.
Cheers,
Brian
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