"GeorgeB" wrote in message
...

Ah, because the REAL rounding rule, designed so that averages will not
become distorted high from rounding 1/2 up, is to round 1/2 to the
EVEN number.


If these runways were at the same field, your method would have runway
designators that differ by twenty degrees for runways that have a difference
in azimuth of only ten degrees. I think I'd round both in the direction
that local magnetic variation was moving.