Originally Posted by
dbaker
Impossible. Runway heading granularity is 10 degrees by definition.
Even if you were right (which you're not), re-numbering the runway at 5 degrees would result in no additional accuracy since runway 12, for example, would become runway 13 when the heading was 125.
That's 3 degrees tolerance between the expected runway number and the runway heading. For example, a runway can have a heading of 256 and still be 25 but when it becomes aligned with 259 it will have to be renumbered to 26. Exceptions apply for cases when the runway number is used to distinguish between runways with the same heading (SLC, LAX, DFW, etc.)