[playworker]

My Dad was once gifted a Silva compass which he gave to me to take on a Boy Scout expedition, everyone was baffled by the fact it had 400 "degrees" marked on it.

Maybe we need to go metric with our circles too: https://en.wikipedia.org/wiki/Gradian

[sllabres]

Surveyors seems to use Gradian/gon often.

There is still another circle measurement, the mil which is 6400 for one turn. But I just learned by reading the wikipedia page, that there is not only the 6400 NATO mils I knew, but also 6000 Warsaw Pact mils or 6300 Swedish "streck"

[BurningFrog]

Swedish "streck" = (short) line.

[fanf2]

The nautical mile is the length of an arc minute on the equator, the circumference of the earth divided by 360 * 60

The kilometre is the length of a centigrad of arc of the meridian through Paris, the circumference of the earth divided by 4 * 100 * 100