Now it depends where you are just what you make of this. American (in the broadest continental sense) mariners will recognize this color as denoting the starboard limit of a channel as you approach from the sea. Excercising the true spirit of utter contrariness, in this country and most of the world excluding America navigators recognise this red coloured buoy as showing the port limit of a channel. Now I'm sure you won't forget this as you sail your expensive yachts up the Humber on your way to the city of culture. If, however, you need to look up port and starboard then perhaps the train is your best bet.