Hi Rod,
Hope your testing with all three work out.
I mentione to the Starmap developer about the lack of alignment function and I believe he is going to write in a single and n-star alignment function.
The compass interference can pop up at anytime
where an app is using the compass function.I have had not had it appear very much but it would be about equal in both apps.
If you are still having the connection problem with SkyVoyager there were are a couple of firmware releases that you may need to apply.
Cheers