when we polar align our mounts, many of us use our phone compass to get a rough true north. Unfortunately, the magnetometer in our phones can be unreliable. The developer of PS Align Pro has updated the app to make it easier to get a better true north reading. You can now use a bright star or planet to calibrate your phone's orientation.
Eric Wilkes has a video about it here:
This video is for the MSM Nomad tracker but you can use the same concept to get a better north direction for your mount before you start polar alignment.
You can also read about it on his website.
I tried it during the last clear night we had (before the smoke) and it made my polar alignment much easier. I use ASIAir's all-sky alignment because a tree blocks my view of Polaris.
If you already have it, you can download the latest version for iPhone from the App Store. For new users, PS Align Pro costs $4. It is now also available for Android phones from the Google App Store.
cheers,
Shireen