On Fri, Aug 23, 2013 at 1:15 PM, Jens <[email protected]> wrote:

> Please look at and comment: 
> http://www.flickr.com/photos/bladt/sets/72157635199289372/

I looked at the 8391 pair, and I don't think the two programs actually
disagree on the azimuth. Here they are overlaid:

http://i.imgur.com/uW7NiYn.jpg

They do differ in the depicted angle of view--is that supposed to
accurately show the field of view from the EXIF? If so, maybe one is
not applying the crop factor correctly?

The two programs also have different imagery, in which the towers are
photographed from different angles. I think that also makes it harder
to compare them visually.

In terms of the absolute error of the O-GPS1 azimuth, I'm not sure
what degree of accuracy is to be expected. The electronic compass in
my iPhone seems fairly erratic. Rob's point is well taken, as
high-voltage lines can affect compass readings, as could metallic
objects, magnets, etc. in your vicinity.

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