Constant METRES_PER_STATUTE_MILE 

pub const METRES_PER_STATUTE_MILE: f64 = _; // 1609.3440000000001f64

The statute mile, exactly – 5280 × METRES_PER_FOOT, a fixed international definition. Distinct from METRES_PER_NM: used for an imperial (non-nautical) display preference, as opposed to a nautical-imperial one.