I down loaded the free app. and so far it seems to be quite accurate. I have only used it once when out sighting in a new mil/mil scope. Tried it out to 400mtrs where it was bang on for elevation and windage. At 550 there was too much wind and I had trouble spotting my own shots so gave up, but it looked there abouts. Waiting for another chance to get out again. I haven't used any other app. but against my old verified moa chart it looks good and it's free.
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