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Full Version: Why are there multiples of the same Length Units
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I was looking into the length units and noticed mile and miUS. Are these the same because it says that a miUS is 5280 ft?

Also, there are two abbreviations for inch: in and inch.

Are these made just for personal preference?
You have miUS, ftUS and inUS because you have something called a "us survey foot" and by extension a "us survey mile".

Primarily, this is of importance (and quite extremely so) when working with geodesic conversions between different coordinate systems.


"in" vs "inch" is due to the CAS already having a definition that was incompatible with the HP convention... unfortunate, but was made as clean as possible.
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