The first marker you see entering from sea is the open, or safe water, marker. A lighted marker flashes at night and during restricted visibility.
The next marker you see as you enter this waterway is the port buoy. This tells you it is Green, has the number 1 on it, and it Flashes Green once each 4 seconds.
When entering from seaward you may find two channels which separate and go in different directions. A junction marker uses its top color to show you the primary channel. This is represented by a Red and Green buoy. You use the top color and shape as if it were a stand alone marker if you want to follow the primary channel. In this case leave the green junction buoy to the left. To take the secondary channel, use the bottom color.
Red Nun buoy with the even number on it.
Green Can buoy with the odd number on it.