One other thing not covered, on any airport chart, the exact alignment of the runway will be noted, usually down a tenth of degree. So the numbering is a us

One other thing not covered, on any airport chart, the exact alignment of the runway will be noted, usually down a tenth of degree. So the numbering is a useful backup and discriminator, but the charts have much more detail, and modern navigational and instrument systems on runways obviate much of this for most flights anyways.