I have it and i dont know how to use it yet. I have been meaning to email them to suggest a youtube chanel to show you how it is done. It describes 3 ways of doing the measurements, but either way you try, it just beeps a couple times and says it is over. You would have to trace your horizon in like 2 seconds apparently. I will admit that I havent tried to much to figure out how to use it, I have only opened it like 4 times, but it is super beta in my eyes, to the point of guesstimating being more attractive if a real tool is not available.
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