RVR to SM formula....
 

Used to have a very easy formula for converting RVR to statute miles, one that could be done in your head. Now I can't remember it, can anyone help me out?

Think you took the first two numbers of an RVR (1600) and divided by some number??????????

a mile is 5000 feet, for RVR purposes. do the math in your head:rolleyes:

The FAA has assigned conversion values which do not have a very good mathematical correlation to each other. I know these off the top of my head...

1SM / 5000
3/4 SM / 4000
1/2 SM / 2400
1/4 SM / 1600

You can use reported vis instead of RVR for CAT-I and non-prec approaches only. CAT-II/III require RVR.