A nautical mile isn't just a longer version of a regular mile. It's actually tied to the size of the Earth itself

[Seb93]

A nautical mile equals roughly 1.15 statute miles, or exactly 1,852 meters under the international standard, and unlike the ordinary mile, its length isn't arbitrary. It's defined as one minute of latitude, meaning one sixtieth of one degree along a meridian circling the Earth, which is why the measurement is directly tied to the planet's actual physical size rather than some historical unit of measurement like a king's foot or a Roman pace.

That connection to latitude made the nautical mile enormously practical for sailors long before GPS existed, since a navigator could measure their ship's position using the stars and immediately translate that angular measurement into an actual distance without needing any separate conversion. Aviation adopted the same unit for exactly the same reason, and it remains the standard measurement for both sea and air navigation worldwide today, even though almost everything else in daily life uses the ordinary mile or the metric system instead.

Nautical Milewww.britannica.com

[Storm]

The direct tie to latitude is what actually makes this unit genuinely elegant rather than just an arbitrary alternative measurement

[Shannon91]

Never realized aviation uses the exact same unit as sailing for the exact same navigational reason, that consistency across both domains makes sense once you know why