In Australia, we use click in everyday speach.
As I understand it, it reffers to the odometer of a car 'clicking' over.
When we give directions we say "its 5 clicks down the road" meaning 5 kilometers.
When we sell/buy a car, the the question is asked, "How many clicks its done?" reffering to how many k's on the odometer reading.

I just thought it was Australian slang. Even my grandfather used it, and he served in World War 1, so its use seems to go back a fare way.