I did some testing on the compass direction and the results are, eh,
interesting.

I compared the readings I was getting with the Google Sky Map and they
were basically the same. Here is what I did.

With both my app and SkyMap I had the phone in camera position. I
positioned the phone on a piece of paper and drew a line on along the
side in contact with the paper. I did this for N, E, W, & S. As I
said, the lines from my app agreed with the ones from Sky Map.

I drew a N/S line using a physical compass. The lines for N & S were
rotated a bit clockwise from being right angles to the N/S line. The E/
W lines were both skewed even more clockwise from the N/S line. [Yeah,
I've calibrated the phone doing figure 8's and flipping it while
rotating it, etc.] It also appears that the sensors expect the phone
to be in camera position, i.e. left side down, because when the right
side is down all the compass points are even worse.

I'd be curious to see if other phones get similar results.

Rud
http://mysticlakesoftware.blogspot.com/

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