Do not pass between the buoy and the shore
A boat should cruise between a green and red buoy. The red buoy will always be located on the right side of your boat. Red buoys will always mean , returning, red, and right. There will be a number on a red buoy that will give the chart location. The numbers will always be even.
Green bouys are on the port side of the channel IF you are returning from sea (moving upriver) hence the maxim, "Red/Right/Returning" known in sailing parlance as the 3 R's.
A red cone shaped buoy, called a nun buoy, usually marks the right side of the channel when you are returning from the sea or going upstream. Remember it by saying, red, right, returning.
Preferred channel markers are buoys showing red and green bands.
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
Keep the buoy on your right side
It means 7.
Keep the red buoy on the right side of your boat. If the red buoy is on the left side of the boat, you're about to run aground. "Red to the Right, Returning."
Pass the buoy so that it is to your right (red right returning).
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
A port or starboard buoy depending on what region you are in
red