Kilometer is a measure of the so-called “metric” system. It is the system that is superior to all other systems and does not involve body parts like “feet” and such. The need for a nautical kilometer is not there because a kilometer is like the name suggests: one thousand meters. It is properly defined just by its name. There is a larger amount of people on the planet that do not feel comfortable with measuring distance with units that actually make sense. Instead they rely on a system where strange ratios are used. That is why you have a nautical mile but not a nautical kilometer.
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