Thanks to everyone & especially Jack for the help and the great links.
I wouldn't put it past them that 68 is really a trick. Will have to go thru several hundred questions to see if any of them reference that pic :-)
I kinda doubt your average Ontario sailor knows more than identifying a boat as power or sail. Then again not many minesweepers here, and if you catch any fish they likely have 3 all-around green lights. And none of the harbours have been dredged (and they all need it, watch yer depth)....