Navigation Buoys and Channel Markers 101: What Do the Red ...

If you're new to boating, you may find yourself asking, "What do all those red channel markers and green buoys mean?"

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Well, there may not be any road signs or painted lines out on the water, but fortunately as boaters we have plenty of channel markers, buoys, and aids indicating everything from channels to no wake zones. But for someone who hasn’t spent years on the water, all those red markers and green buoys can be confusing.

Never fear, new boaters—we’re here to help.

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Channel Markers vs. Buoys

All the different “road signs” of the water are called “aids to navigation.” These include fixed markers on poles and pilings as well as a variety of floating buoys that are anchored to the bottom. Why will you see a mix of fixed channel markers on poles, and floating buoys? Mostly, this is a matter of physical geography.

In deep water, it’s difficult to drive a piling, so putting a buoy there makes more sense. In other places, channels may shift and change over time, so again, utilizing a buoy (which can be moved and re-anchored at a later date) is the norm. But in areas where the bottom composition doesn’t change much over time and the water is shallow enough to drive a piling, a fixed marker (which doesn’t require as much regular maintenance) is often a better option.

The bottom line? What’s important to remember is that boaters should treat fixed markers and buoys exactly the same.

Also remember that some, but not all, markers and buoys will be lighted. Those that are lighted will blink at a specific frequency. These frequencies are marked on charts and chartplotters. So if you see a red one blinking every three seconds, for example, you can look at your chart, find the nearest red marker that blinks at that frequency, and easily identify the marker you’re looking at.

Channel Marker Colors: Understanding Red and Green Markers and Navigation Buoys

Most of the markers and buoys you’ll see will be either red or green, and these colors help identify which side you’ll want to pass them on to remain in a channel.

• As a general rule of thumb, when you’re heading from open water to inland water, or heading upstream in a river, you’ll want to keep the red markers to your right and the green ones to your left.
• So, when you’re heading from the ocean into a bay, or from a bay into a creek, harbor, or port, the red markers belong on your right side.

Hence, the old saying “red right returning.” Sometimes you’ll see an aid to navigation that has horizontal bands of both red and green. These mark the junction between two channels. In this case, the color that’s highest on the marker indicated the preferred or primary channel.

Another aid to navigation you may see are called “non lateral” aids to navigation. Each of these has their own specific use and meaning as follows:

• Diamond-shaped Dayboards – These are used to help you determine your location, more or less like the “you are here” marks on a map.
• Safe Water Marks – When you see an aid with white and red vertical stripes, you know there’s unobstructed water on both sides.
• Danger Marks – Look out for red and black horizontal bands, which indicate an isolated danger that can be passed on either side.
• Range Markers – These are pairs of markers, often with non-blinking lights. When you’re in the middle of the channel, the two markers and/or lights line up vertically. The colors on range markers are related to how well they stand out versus navigation, so when you see their three vertical stripes remember that you don’t have to worry about what color they are.

• Information and Regulation Markers – Orange and white aids are used to indicate various regulations like speed zones and fisheries regulations. These will have an orange diamond shape on them if they mark a hazard, a circle if they indicate regulations related to how you operate your boat, a diamond with a cross through it if boats are prohibited from the area, or a square when they are used for informational purposes.
• Special Aids – Solid yellow markers are called special aids, and they mark things like anchorages, traffic separation, areas with cables underwater, and other unique situations.
• State Waters Obstruction Marks – Don’t pass between one of these black and white vertically striped buoys, because they indicate an obstruction from shore to their position.

In addition to all of these aids to navigation, you may also come across white buoys with a blue stripe. These don’t actually relate to navigation but keep your eyes out for them because they’re mooring buoys that people secure their boat to in harbors and anchorages. Remember that most are private and you need permission to use them.

Driving a Boat: Step-by-Step Guide

For more information, please visit Marine Buoys.

How to Read Channel Markers & Aids to Navigation

Okay: now that you know what all those red markers and green buoys mean—as well as the yellows, blacks, whites, and oranges—you can effectively navigate your boat through most waterways. Of course, there’s more to getting where you’re going than just understanding the navigational aids. Be sure to read Marine Navigation: How to Navigate a Boat to get the complete scoop.

Marine Navigation: How to Navigate a Boat

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Bifurcation buoy

A bifurcation buoy is used to mark the point at which a channel divides into two branches.

A bifurcation buoy is used to mark the point where a channel devises in to branches. You may pass this buoy on either side (port or starboard side) when moving upstream. It's coloured with red and green bands. The main or preferred channel is shown by the color of the top band.

Bifurcation buoys are used at junctions (where one channel splits into two channels). Naturally, one of the two channels will be wider, deeper, and safer; it is the main channel. The purpose of the bifurcation junction buoy is to indicate which channel is the main channel.

Diving flags

A diving buoy marks an area where diving activity is taking place. It is a flagcoloured red with a white diagonal stripe, extending from the tip of the hoist to the bottom of the fly.

If a diving operation takes place from aboard a pleasure craft, Code flag Alpha or flag A (white and blue) from the International Code of signals which means “I have a diver in the water, keep well clear and at low speed” must be displayed.

This particular mark is quite interesting as it can be viewed from two different perspectives. On one hand, it is known as the Safe Water Mark, as it signifies the point where a vessel leaves behind the safety of a buoyed area and ventures into the vast open sea.

On the other hand, when a vessel approaches this mark from the open sea, it is referred to as the Fairway Buoy. It serves as a clear indication that a buoyed channel or harbor is about to begin.

The primary purpose of this mark is simply to define the boundary of a buoyed harbor, acting as a guiding beacon for mariners.

You can easily identify this mark by its distinctive red and white vertical stripes that alternate all around. And if it has a top mark, it will be a striking red ball.

For more Marine Aids to Navigation Solutionsinformation, please contact us. We will provide professional answers.