Flashing green light, flashing every 4 seconds, 15 feet high, 5 mile nominal visibility, #161 painted on the mark.
Note: the mnemonic "Even red nuns have odd green cans" will also tell you that the shape of the green mark will be square as opposed to triangular. If it was a buoy, it would be a can (as opposed to a nun shape for the reds). "Red right returning" will also tell you what side to keep which mark as you are returning from or going to sea. The ICW
is marked as "returning to Texas" except, of course, those stretches where the ICW is combined with another set of marks like those of a river. Keep a sharp lookout for where the colors switch sides.
We have large red and green "chip clips" that we hang on the bimini
in easy view so that we'll be reminded what side we should be keeping which marks. It's easy to get complacent so we try to use everything we can to keep us alert.
Hope this helps!