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