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I find any of the star apps or compasses apps somewhat variable and not accurate. Useful nonetheless. Google Sky seems most stable of the free ones but lacks information. SkyEye is pretty good. Tossing up whether mobile Observatory is worth trying, or Stellarium.
The Inclinometer is useful and seems quite accurate to set your dec angle. The trick with it is to use the device aligned in both directions ie take a measurement then turn the tablet\phone 180 * and check it reads the same. If it doesn't then you split the difference and there you have level or dec angle pretty dang close.
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