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I'm a translator, and currently I have some issues associated with RWY designation. There is a runway with the magnetic direction 246°. How would you call it? So let me put it like this. In Wikipedia, they say that you truncate the three-digits magnetic direction to the first two figures and you get 24, while in some other places it is said to round the result up or down, so I shall get 25. Which is correct? Will it be RWY24 or RW25?


marked as duplicate by ymb1, J. Hougaard, vasin1987, DeltaLima, Federico Aug 18 '17 at 10:06

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  • $\begingroup$ Everything i've seen indicates rounding rather than truncating, though I /haven't/ seen any mentions if headings ending in 5 use round-to-even or something else. … Also, is this a real airport? You should just be able to find the published approach docs or similar if so. Heck a satellite map might verify the numbers physically​ (if the magnetic state of the area hasn't changed lately…) $\endgroup$ – StarWeaver Aug 18 '17 at 7:11
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    $\begingroup$ @Pete what do you mean? There are many airports with parallel runways. Atlanta Hartsfield has even 5 runways in exactly the same direction. Approaching from the west they are named 8L, 8R, 9L 9R and 10 from north to south. So sometimes truncating, rounding & being creative is being used. $\endgroup$ – DeltaLima Aug 18 '17 at 9:25

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