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Sky Safari doesn't need to use internal tablet compass or movement sensors, if your interfaced through something like an Astro Devices Nexus wifi box, as all telescope movement and tracking is provided by the encoders mounted on the scope. It depends on how your using the tablet obviously - if your just attaching it to the scope and relying on the tablet internals to provide the position info then yes you need to be sure it actually has that capability and it properly oriented. Just attaching it to the scope will never be as accurate as interfacing to encoders - but it is much cheaper.
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