Morgans wrote:

"Mike W." wrote


No, Bill has this right. If rounded correctly, 045 becomes 'runway 4' and
055 becomes 'runway 6'.


I'm sure I read a reg quoted earlier in this thread, that you got to choose
going up or down, when it was --5.

You would choose the number to which the magnetic variation is taking
the runway. For example around the western US you would choose the
higher number as if you don't you'll have to renumber the runway that
much sooner.