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A simple sight tube might help in getting the first 'eyeball' alignment going.
If you are going to be using somewhere consistently like your backyard you could do a solar noon & plumb bob line on the ground. That will give you a good Nth/Sth line to start with. Probably accurate enough for widefield. I find the digital compasses on phones\tablets can be somewhat inaccurate.
Another method is to get onto Google Earth and zoom in on your site beforehand and then look for a horizon landmark as a reference point either due Sth of it or offset by some measurable amount. I used this first at home to set a line on the driveway for repeated use.
A proper hiking compass can then let you establish a pretty good Nth/Sth line using it as a protractor.
The inclinometer applications on tablets and phones seems to work quite well as long as the phone has a good straight edge to sit on.
Hey Presto SCP !!
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