Tick box 4 gives us clue to the applications of the first three tick box subjects, ie as units of windage/elevation
Then conveniently Vietnamcam uses a modifier to the title in the form of a question in the first post in his thread.
So there's two clues as to what he's on about, one more subtle than the other.
So you are right, it's a poll on measuring distance, and the first clue is in the heading, and the second clue is in the question in the first post, both telling us it's windage/elevation distance.
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