system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is the purpose of Nautical Miles and why dont we just use regular Miles or Kilometers for ocean or air travel?
gpt
Nautical miles are useful because 1 nautical mile is 1 minute of latitude, or 1/60th of a degree of latitude.  It makes them useful when navigating on charts, where latitude and longitude are in degrees and fractions of degrees.