if you standardise one thing, what is it and why

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Our system of measurement. There can be only one!
- There already is a standardized measurement system that is used allover the world.
  Except for the USA, of course. But that sounds like an USA problem to me.
- because murica everything is now meassured in bald eagles.
  how tall are you? 2.5 BE how much is your weight? 27 BE How old are you? about 1 BE
  converted from facts here https://www.nationalgeographic.com/animals/birds/facts/bald-eagle
- While I agree in general, stuff like the nautical mile serve a purpose. I think units that are based on practicality should still be allowed. https://www.quora.com/Why-do-we-measure-roads-in-regular-miles-and-not-nautical-miles
  If it is based on some kind of arbitrary definition and conversions between units of the same measuring system is hard we should do away with it.
  Recently had a Stress strain chart which had lbs/inch² as a unit. Also measuring anything small in imperial is just cursed. 5/16 * 10^-2 inches. Wtf. Also mil and thou. Just adopt metric already.
  
  I don't understand the purpose of a nautical mile. It's just a certain number of metres, right? Originally worked out as some percentage of the distance around the equator.
  Why not use the standard measurement for distance?
  
  Because maps for naval navigation are based on degrees latitude and longitude. So if you travel at sixty nautical miles per hour in latitudinal direction on this globe you will end up one degree further away from where you started. Angles are important in naval applications as well as aeronautical because ships and airplanes can and mostly do travel in straight lines.
  One nautical mile is equal to 1.852 km good luck using that kind of number and converting it to meaningful information on the fly.
  With digital systems it is of course not as important anymore (also they are using the metric definition and converting it to nautical miles internally) but courses are still plotted by hand on maps (eg. as a backup solution if your digital system goes belly up). Having a measuring system where one unit corresponds to something meaningful with little need to pronounce decimals all of the time seems like a good idea to me.
  So for example you can travel 111.12km in latitudinal direction or 60 nautical miles which is equal to one degree latitudinal distance.
  60 is properly divisible by 2, 3, 4, 6, 10, 12 and so on so it makes quick mental calculations easier.
  The unit just makes sense for the application it is designed for.
  
  I'm trying to understand what I'm missing.
  I might be getting my latitude and longitude confused- but I think that one degree of latitudal (east-west, right?) travel would result in a different distance depending on how far north or south I am? I'm thinking of it like walking around the equator, as opposed to walking in a circle around Santa's house, which is obviously directly on top of the north pole.
  But if I travel one degree of longitude, no matter where I am the distance would be the same, right?
- To rule them all!

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