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Hi Greg,
Yes indeed it was true south, using an app called Dioptra (as I recall) on my previous phone. I couldn't find it on the app store last time I looked to load it . I onto my new phone. I must research it again, it was excellent. It could overlay the compass azimuth on to what the camera was seeing as well as the elevation, although I used a inclinometer for that.
Best
JA
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