Unlike the roads and highways that we drive on, the waterways we go boating on do not have road signs that tell us our location, the route or distance to a destination, or of hazards along the way. Instead, the waterways have AIDS TO NAVIGATION (or ATONs), which are all of those man-made objects used by mariners to determine position or a safe course.
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These aids also assist mariners in making a safe landfall, mark isolated dangers, enable pilots to follow channels, and provide a continuous chain of charted marks for precise piloting in coastal waters. The U.S. Aids to Navigation System is intended for use with nautical charts, which provide valuable information regarding water depths, hazards, and other features that you will not find in an atlas or road map.
The term "aids to navigation" includes buoys, day beacons, lights, lightships, radio beacons, fog signals, marks and other devices used to provide "street" signs on the water. Aids To Navigation include all the visible, audible and electronic symbols that are established by government and private authorities for piloting purposes.
The Coast Guard is the agency responsible for maintaining aids to navigation on U.S. waters that are under federal jurisdiction or that serve the needs of the U.S. armed forces. On bodies of water wholly within the boundaries of a single state, and not navigable to the sea, the Coast Guard grants the state responsibility for establishing and maintaining aids to navigation. The U.S. Corps of Engineers is responsible for many of the canals, dams, locks, and other man-made waterways in the country. The Corps also is responsible for the regulation of mooring buoys in all navigable U.S. Waters.
The individual Coast Guard districts also may grant permission to private groups and citizens to place "Private" Aids to Navigation. These aids allow individuals or organizations the ability to mark privately maintained channels, zones or waterways. These aids must be pre-approved, and must be maintained by the individual or organization.
The term "aids to navigation" encompasses a wide range of floating and fixed objects (fixed meaning attached to the bottom or shore), and consist primarily of:
Both Buoys and Beacons may have lights attached, and may have a sound making device such as a gong, bell or horn. Both Buoys and Beacons may be called "marks".
Caution: Do not count on floating aids to always maintain their precise charted positions, or unerringly display their characteristics. The Coast Guard works constantly to keep aids on station and functioning properly, but obstacles to perfect performance are so great that complete reliability is impossible. Only use floating aids for use as a navigation fix when you cannot see a fixed point of reference.
Depending on where you boat in America, you may see several differences in how navigational marks are colored, numbered, or lighted. Regardless of the location, buoys and beacons are placed in very specific locations, to mark either a particular side of a waterway, or some other navigational feature. The primary system in use is referred to the "U.S. Aids to Navigation System". The U. S. Coast Guard maintains this system in conformance to the International Association of Lighthouse Authorities (IALA), which is an international committee which seeks to ensure safe navigation, primarily through the use of common navigation aids and signals.
The "LATERAL" system is the familiar RED RIGHT RETURNING system, meaning that on all navigable waters returning from sea, the red even-numbered marks are on the starboard (right) side of the channel and the green odd-numbered marks are on the port (left) side of the channel. Numbers on the marks ascend when traveling from sea to harbor--if you don't have a compass and become disoriented on the water, you will always know you are heading upstream if the buoy numbers get larger as you travel.
Port side numbered aids are green in color, odd numbered and may be lighted. Port side marks are located on the left side of the waterway as you travel upstream, and the buoy numbers will increase as you head upstream. (Chart depictions are shown next to the marks) Port-Side Buoys have a cylindrical above-water appearance, like a can or drum floating on its axis. Commonly referred to as "CAN" buoys. Beacons - Port side beacons have square marks attached to them, with two shades of color and a reflective border.
Starboard aids are red in color, evenly numbered and will be on your right side as you travel upstream. Buoy numbers increase as you head upstream, and may have a red light. Starboard-side buoys have an above-water appearance like that of a cylinder topped with a cone, pointed end up. The cone may come to a point or be slightly rounded. Commonly referred to as "NUN" buoys. Starboard-side Beacons have triangular marks attached to them, with two shades of color and a reflective border.
For the sea buoys that delineate channels off the coast of the United States, and for the Intracoastal Waterway (ICW), red is on the right (shore side) when proceeding clockwise around the U. S. from the East Coast to the Gulf Coast, or proceeding north along the West Coast.
ICW marks are further identified by a small yellow reflector at the bottom of the mark. The same port and starboard marks shown above will look like the following.
Numbers on the marks ascend when traveling in this direction. Where the IALA-B and ICW marks meet, one must be very careful to observe the change in meaning by referral to local charts.
These diamond shaped marks are used to help the vessel operator determine location on a nautical map. When you see a dayboard, and find the corresponding mark on the chart, you know your precise location. They may be lettered, and may be lighted with a white light. Their color reflects that of nearby lateral marks.
These marks are used to mark fairways, mid-channels, and offshore approach points. They have unobstructed water on all sides. These marks may be lettered, and may be lighted with a white light. They may also have a red top mark.
These indicate a danger which may be passed on all sides. They are erected on, or moored on or near danger. They should not be approached closely without special caution. They may be lighted, and they may be lettered.
Special marks have no lateral significance (meaning they don't tell you which side of the channel or river you may be on). These marks are used to mark a special feature or area. These include area limits for anchorages, fishing grounds, or dredging/spoil areas. These buoys may be lighted, and if they are it will be a fixed or flashing yellow light. Shape is optional, but usually follows the shape of the navigation buoys that it is positioned near.
Mooring buoys come in two different shapes; spherical and cylindrical. Both have white bodies with a solid blue horizontal band on the center of the buoy. Mooring buoys may have a white reflector, or a white light attached to them. Mooring buoys are the ONLY buoys to which you may legally tie your boat. Buoys are generally placed in marked anchorage areas, and you must take caution if you are traveling near buoy areas. Check your state boating guide for particular operating restrictions in anchorage areas.
These are pairs of unlighted or lighted fixed aids that when observed in line show the pilot to be on the centerline of a channel.
Regulatory Marks re designed to assist boaters by informing them of special restrictions or dangers that they are approaching. Regulatory marks are white "can" buoys that have an orange shape on them. The mark will give either a warning or instructions on how to proceed. The shape determines what type of mark it is.
This system was originally intended for use by states on lakes and inland waterways that weren’t covered by nautical charts. The buoys used in the Uniform State Waterway Marking System (USWMS) used colors, shapes and marking patterns that differed greatly from the U.S. Aids to Navigation System (ATONS).
In 1998, the U.S. Coast Guard decided to phase out the USWMS to avoid potential confusion of boaters and instead, favored using the more widely recognized ATONS. By 2003, the USWMS was completely phased out. Below are a few of the differences from the federal system you should know about.
Here's a summary of the important changes regarding the phase out of USWMS:
The state system differs in several ways, in case you happen to encounter them. These aids also assist mariners in making a safe landfall, mark isolated dangers, enable pilots to follow channels, and provide a continuous chain of charted marks for precise piloting in coastal waters. The U.S. Aids to Navigation System is intended for use with nautical charts, which provide valuable information regarding water depths, hazards, and other features that you will not find in an atlas or road map.
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Red-topped White Buoys
Black-striped white Buoys - Inland Waters Obstruction Mark
Black-topped White Buoys
GPS, or Global Positioning Systems, are satellite-based navigation systems developed by the U.S. Department of Defense for military purposes—but they're familiar to most of us as the navigational system used by our phones and cars. Whether you’re talking about the GPS on your phone, in your car, or a marine GPS for boats, all these units receive radio signals from multiple orbiting satellites to determine your position.
There are currently 30 active GPS satellites in orbit, plus some extras reserved as spares in case one or more satellites has mechanical difficulties or is damaged. By knowing the position of a minimum of three of these satellites, and calculating the time differences between the transmitted signals—which are moving through space at over 186,000 MPH—your GPS receiver can determine its exact position anywhere on earth.
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The more satellite signals your GPS receives, the more accurately it can calculate that position, and while accuracy depends on a number of factors ranging from atmospheric conditions to receiver quality, when many multiple satellites are in view a common GPS receiver can typically put your position within a 16-foot radius. High-end receivers with dual channels can get significantly more accurate.
Originally boating GPS units displayed your position in latitude and longitude, and while that information can still be displayed, on most modern marine GPS people use a digital chart to see where they are—much like you can look at a street map showing your position on your cell phone. A GPS that can display charts is called a “chartplotter” or “GPS/chartplotter.” And in recent years digital charts have become much more comprehensive in the areas they cover, have improved detail levels, and better accuracy. In fact, many modern chartplotters also allow you to improve the digital charts you look at in real-time as you operate your boat, by matching up your GPS position with depth soundings taken by your fishfinder.
Navigating with GPS is usually the most efficient, easiest way to navigate a boat, but far too many people use it as a graphical representation rather than a numeric one. You can display a digital chart on your GPS unit, and steer the boat in such a way that the boat icon at the center of the screen points in the correct general direction. But you’ll steer much more accurately if you instead use a dedicated “steering screen” that gives you the numeric compass heading you want to follow, the course you’re actually steering, and an arrow or indicator that tells you whether to steer to port or starboard to get back on the most direct course.
Be sure to read Marine Navigation: How to Navigate a Boat to get a more complete picture of navigating boats both with and without GPS. And remember: while most of us do depend on GPS to navigate our boats most of the time, no one should ever rely on it 100-percent. Like any electronic system GPS is subject to failure and you’ll need to know how to get back home when your electronics let you down.
Learn More: Marine Navigation: How to Navigate a Boat
Even boaters who never leave sight of land should have a GPS/chartplotter aboard, on just about any boat. You never know when you’ll encounter fog, or a mechanical issue forces you to stay out late and navigate home in the darkness. And at times like those, you’ll be quite relieved you have GPS aboard. Plus, today’s units are so inexpensive (you can get a basic GPS/chartplotter for just a couple hundred dollars) that there’s really no excuse not to have one.
Wait a minute—your phone already has GPS, so why get another one just for your boat? That’s a good question, particularly because you can use a number of boating apps to more or less turn your phone into a mini-chartplotter. Cell phones, however, have a number of drawbacks:
So while having a cell phone with a navigational app loaded up can come in handy and is a good back-up to have aboard, it should never be depended upon as your main navigational tool.
Anchor Alarm
A feature of GPS that’s useful to boaters in particular is the ability to set an “anchor alarm.” You can establish a geofence around your boat while it’s at anchor, and if the anchor drags or the line comes loose and your boat goes through the geofence, your GPS will sound an alarm.
Security System
Some of today’s systems also allow you to interface with your boat’s GPS from afar, via an app on your cell phone, so it acts as a security system. You can set that geofence up around your boat, and if someone tries to steal it, you’ll get a text alarm as soon as it moves out of position.
Additional Features
If your GPS is “networked” (wired to the other electronics aboard the boat) it can also fulfill a number of additional functions.
To learn more about GPS and see the government’s official statements about it, read FAQs, and more, visit the official U.S. Government GPS website.
Read Next: 5 Best Marine Navigation Apps for Boaters
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