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My experience using an iPad 3 + several mobile apps is the pointing isn't all that great, even without any adjacent metal objects. It is frequently off enough to make it useless as a pointer.
That said, I've done design sketches to make a mount for it on my binocular paralellogram mount, sitting next to the binoculars and coupled with a parallelogram linkage to align them. If I get around to it I'll post a review in the ATM section of whether or not it was any good in practical use.
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