International System of Units -> Km (not Miles)

[Jerome-Liger]

Why american's developers only calculate distance with miles and never think about all the rest of the "standardized-world-developers" ?

Please, use the ISU (International System of Units) by default... it has been released in 1960... so any length must be expressed in meters (or cm/Km/...)

https://en.wikipedia.org/wiki/International_System_of_Units

And if you want to add an overload/option to get the result on miles, I'm not against ;-)
(For example, MAUI Location Extension ask the unit (Km or Miles) in parameter : https://www.andreasnesheim.no/calculating-distance-between-your-device-and-a-location-with-net-maui/)

Some rockets have already exploded in the past for this kind of imperial units problems... with unfortunate human deaths.

[madelson]

I think DistanceUnit should be a required parameter. If I just see GeoCalculator.GetDistance(a, b), it is not clear what that distance is measured in (meters? km?).

Furthermore, Changing the default DistanceUnit from Miles to Meters/Kilometers should come with a major version bump since just upgrading would break anyone using the default without their knowing it. However, removing the default would only be a source-level break so this would not require a major bump.