I'm using it on an iPhone and it's really annoying when it tells me that it can't find the weather data for my current location, because it only uses US based services for that. Not that I'd use it anyway, but it occasionally decides to tell me.
Also it's non-intuitive to save a ballistic profile, you can't do it through the HUD, you have to calculate trajectory in the calculator screen and add to favourites from the results page
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