Last Thursday we traveled a very long distance in a Matatu crossing over the Equator. The number of passengers inside was 21 adults inc me, plus a child.
I tried the Equator water test. I confirm that I witnessed (with my own eyes, not theory) 10ft north of the equator when you pull the plug the water goes clockwise and just 10ft south of the equator the water goes anti clockwise.
On the Equator, no movement occurs, the water goes straight down the hole.