The first time I sailed out of Pompey harbour, starboard hand markers were black and the person who invented the small boat channel may have still been in school.
I was at the time.
Wow, that brings me back. Mind you the stbd buoys where I used to sail were only repainted from black to green in 2011!
MN#123/11 SHANNON NAVIGATION - Lough Derg - Marker Colour Change
Though if ever that way, be aware that a pole in mud counts as a marker and you have to guess its colour