PPRuNe Forums - View Single Post - CAT I RVR minima...why?
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Old 5th December 2013 | 07:02
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bucket_and_spade
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Joined: Mar 2008
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From: UK
KISS.

Initially I'm sure it was based on how far ahead you needed to see in order to pick up the runway or lights when popping out of cloud at 200' AGL.

So the answer is probably...geometry!
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