Damn those early sailors - they got it all arse about.
Now we have to live with it.
Didn't know it applies to ocean currents also! Are there any others?
Then there are those terrible twins - Port and Starboard. They never did come instintively to me and when I called a "Break Port" to avoid enemy fire my finger four section went in two directions. Soon after was able to ban their use in the RAAF at the same time we went decimal with flying hours.