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Most people don't need, or would use, all of the features of SkySafari Pro, the Plus version has full telescope control functions. I tried Mobile Observatory but it is not up to Sky Safari IMHO.
The problem with using an Android phond or tablet for alignment is the varibility of the device hardware. A good handheld compass is more accurate. What do you need to align? If your mount has GPS onboard all you really need is to level it and align to true south.
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