Exactly, a 1000th of a millimeter is also smaller than a 32nd of an inch...
That may all have been valid in the middle ages but we now live in the 21st century.
I still wonder how you're going to use a sextant from the cockpit of an airplane by the way.
The base 10 system is a lot easier to use and the old system was even more arbitrary given that not every barley corn has exactly the same size. A meter always has the same size unlike the distance a person can walk in a day.
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