To be fair: 1. The nautical mile is an SI derived unit, now fixed at 1852 meters. 2. It's a more useful unit than the kilometer for long-distance navigation d

To be fair: 1. The nautical mile is an SI derived unit, now fixed at 1852 meters. 2. It's a more useful unit than the kilometer for long-distance navigation due to its historical definition in terms of arc along a line of latitude making it easy to work with on charts.