What's the difference between runway visual range (RVR) and runway visual value (RVV)? After reading about them in the instrument procedures handbook (p.1-10), I have done some research on the web, but it's still a little confusing. As far as I know, flights operating under part 121 or 135 use RVR as their approach visual minimum, but the handbook states "RVV is used in lieu of prevailing visibility in determining minimums for a particular runway." In what aspects do they exactly differ, and how are they used differently in the actual commercial aviation world?
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