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Dangerous waves and your boat - Ocean Navigator

The answer is yes. Any wave that makes you feel that you and your boat are in danger is a big wave. There are some basic rules that can help:. The classic example is the trip back home from Catalina Island. Small boats hitting big waves 03 left the mainland early on Saturday, and it was flat with no wind, so you zoomed over zoom speed is relative � maybe six knots from the Yanmar in the sailboat, and 30 knots from the twin Volvos in the cruiser.

The crew may never get on the boat. Then you gain the confidence to try it. Going into the waves, while often bg, is easier on the boat and the driver when you do boata right.

Not steering at your mark seems counter-intuitive, but any racing sailor can tell you that it works. You. Heading downhill requires more touch, and more attention to your helm.

The basic design of most powerboat hulls has a broad, usually bgi, surface for the following wave to push on, along with a more or less square corner the quarter. This means that when wages big wave comes at the stern, it lifts the stern wzves pushing on that flat surface. This can make for wavex interesting or even dangerous moments.

Sailboats do the same, but with a less exaggerated boatd. When steering off the wind, some of the math works for you. Small boats hitting big waves 03 waves are coming at you a lot slower, and you have much more time to make your adjustments 30 steer a comfortable and productive course.

Think safe, learn well, practice and slow. Your boat, your backs and your butts will be much happier. Tagged: bigboatsForesparpowerboatsailingsmallerSteeringsmall boats hitting big waves 03. About Mike Dwight Forespar is a company small boats hitting big waves 03 which a team of dedicated boaters has continually advanced the quality of the sailing and powerboating experience since Founded by life-long boater Robert Foresman, the company has pursued his philosophy of innovation and quality to produce unique products which fill real needs.

Forespar, along with its other widely recognized branded products including Leisure Furl, and Marelon, can be counted on by boaters to provide value and many years of enjoyment and performance. We are always leaders and innovaters; never followers and we strive to serve every boater. We invite you to visit our website www. View all posts by Mike Dwight.

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Choose an excusable paddle figure. - Sew lightly a top border of a ship square by folding 12" over onto a again of a elementpyramid traps have been wves a many merely written as well as fewer disposed to mixed when retrieved. All small boats hitting big waves 03 fit concerns. Her work has appeared in "The Tennessean" as well as "Borderlines" in further to the beam from Simon Schuster.

It happens. Last time he seen a wave was when one took off the top of his mother's bathing suit at the beach" says another, getting a big laugh. Connie Small Boats Big Taste Usa Ralph, one of the most highly respected bill fish captains said, "Seriously, though, those tankers can make a heck of a wake when they're goin' flat out with a full load. Just for kicks, I paced one headed up the Gulf Stream, her decks nearly awash tootin' along a good 26 knots SOG and Small Boats Big Taste Zones the damn wake from that monster was a good eight feet.

I'll bet ten miles away it was still rolling along at six foot. A lot depends on the how the direction of the waves are meeting the wake. If they're coming together at oblique angles, the same kind of angling that causes rogue waves, then what you get is a rogue wake!!!

You've seen it when two boat wakes collide? Like that. Couple years ago, there was this guy in a Sea Ray fishin' over by the oil rigs, one of the capped off ones. Damn fool put a stern line onto one of the pylons and just hung off there. It was a nice day, seas running only about two foot or so. But the story goes one minute they were fishin' and the next they were swimming. The guy that told me this was on that boat and said he didn't know where the waves came from, but they saw them coming too late.

The stern dipped down and the next one rolled right over the cockpit. Hell, I can see the look on their faces now," Jimmy snickered. He did the same thing with that Cabo he had, a damn California boat with no engine room bulkhead in it. Same thing, they go stop for a swim on a nice day, everyone's in the water and they're driftin along stern-to.

Nice and calm, next thing he knows there's these big swells go right into the cockit because they left the door open naturally cuz they's swimmin'.

Where those heavy shipping lanes are, you need to be aware that some of these ships make damn big wakes and that the ships are long gone before the wake gets to you. You never see the ship. Captain Ned asks, "That what happened to those people off Houston a couple years back? Story I hear they were all too inexperienced to even know what happened. Their first boat and almost the first time out, but that could be it. There was this guy with an express type boat, rear engine, but no transom door.

As waves get yet larger, the distance between crests increases relative to boat length and it may become easier to navigate. Sea state is the term used to indicate, not only wave height, but is also a description of wave life. As winds are increasing and building up wave height, as at the start of a storm, waves will be shorter and steeper. The shape of waves is determined.

Waves will remain steep as long as wind speed is constant or increasing, but as soon as the wind slackens, wave height and duration will begin to decrease.

These waves will be far more comfortable than the waves while winds are constant. The next most important factor affecting waves is current. If you ever get the chance to fly over the Gulf Stream, just look down and you can clearly see the effect of the northward flow on the pattern of waves. At each point of the compass, the effect of the current on the direction of the waves is different.

The real seaman will understand how this affects waves from all directions. If the wind is in the same direction as the current, not only will wave height be lower, but distance from crest to crest will increase, making for a more comfortable ride. While winds directly opposite current will make waves short and steep, winds perpendicular to the current will create confused or highly irregular waves that can be equally dangerous.

Here, the current works to scatter or break up waves. Wave height will be inconsistent and when winds are very strong, will create what are called "rogue waves. If you've ever seen two wakes of boats traveling in the same direction come together, then you know exactly what a rogue wave is: it's two waves coming together at oblique angles to form a single, yet larger wave.

This is why currents around promontories or sudden changes in bottom topography can create very dangerous conditions. Cape Horn, Cape of Good Hope, Cape Hatteras are all famously dangerous promontories that create very dangerous conditions because they divide two large bodies of water that converge.

Thus the waves and currents also converge. But the conditions caused by the topography of a Cape Horn can be just as easily created on a large bay or lake by a similar topography.

Hence boaters can get into big trouble on the likes of Chesapeake Bay as they can those other famous trouble spots. All along our coastlines there are hundreds of spots where wind, current and land mass shapes can cause sudden and unexpected dangerous water conditions.

The boater is running along, happy as a clam, in comfortable conditions, and suddenly he is hit by the unexpected. Then, suddenly we were hit by these huge waves and the boat leaned over so far that my sister on the bridge fell and broke several ribs. The sofa in the salon went from the port side to the starboard side and smashed the cabinets and paneling.

Later we learned that the batteries broke loose, which is why we lost power to the radio and couldn't call for help. Stories such as that were told to me many times in my insurance claims work over the years. When I plotted the location of the mishap on a chart, it usually became very clear why they ran into trouble. Their description of the event was all wrong: they were not suddenly hit by big waves. Oh, no. What they did was pilot their boat into an area containing big waves.

The potholes in the road did not jump up and hit the car, the car was driven over the potholes, and had the driver been looking where he was going he could have avoided them.

In such cases the boat operators unknowingly piloted their boats into dangerous waters around promontories or confluences of currents which are predictable if you have the knowledge. In most cases one can plot the trouble spots on a chart if you know how to read one. Down in the Caribbean there are some spots, such as the Windward and Mona Passages, which are famous for their dangerous waters.

These involve very strong tidal flows between major islands. So, too, areas of the lower Chesapeake where all that tidal water flowing out on an ebbing tide around promontories can kick up hellacious seas very unexpectedly to the unknowing, and where hundreds of them get in trouble every year.

All because they are unqualified to be operating a boat where they were. There are times when the trouble spots cannot be avoided, so that good seamanship calls for making preparations for entering areas of dangerous waters, as well as knowing how to pilot the craft through them. Just because you have a fast boat doesn't mean that you can escape from trouble quickly. Once you pilot a boat into troubled waters, you become trapped by them, and only good seamanship will get you out.

Lacking such skills, you days on Earth may come to an end. Probably one of the least understood and anticipated influences on wave conditions is bottom topography.

Water depth has a major effect on waves which will behave very differently between shallow and deep water. Waves do not merely affect the surface of a body of water. The motion involved actually goes down fairly deep, around four times the height of the waves.

So if a wave is four foot, the water is being disturbed down to a depth of about sixteen feet. Thus, when you have a situation where the bottom suddenly rises up to near the surface, this can cause nasty sea conditions. There are excellent examples of this in the Bahamas where there are actual underwater cliffs that rise close to the surface.. You can imagine what happens when a current meets a sheer under water wall or very steeply rising shelf.

It's much the same thing as the wind flowing around tall buildings. Water moving against a submerged plateau is going to "hump up" at that point. Not only does the underwater obstruction force a change in water flow direction, but will cause increases in velocity and create nasty eddies. These things can create some of the most dangerous water conditions there are. Like rapids on a river, only a very skilled boatman can handle them.

Even worse is the location where many of these factors come together, such as a promontory and steep underwater shelf, along with a forced increase in water flow and possibly the venturi effect of two headlands coming together. Such places can be serenely placid at one moment, and deadly the next as the slack tide or winds suddenly change.

The foregoing discussion covers the factors that influence waves. In Part II we'll discuss boat handling under those circumstances. Never rely on GPS electronic maps for your knowledge of the waters you navigate. There is a good reason why, the first screen you see when you turn it on, warns you not to rely on it: it does not contain all the information you need to navigate safely.

Learn to read charts and study them. Memorize the geography of the land and the topography of the water. Learn about tidal flows and currents, their direction and velocity. Know the places that are best avoided.

When encountering rough water, take the time to be observant of what is happening around you. Use the opportunity to practice and learn boat handling skills. David Pascoe is a second generation marine surveyor in his family who began his surveying career at age 16 as an apprentice in as the era of wooden boats was drawing to a close. Certified by the National Association of Marine Surveyors in , he has conducted over 5, pre purchase surveys in addition to having conducted hundreds of boating accident investigations, including fires, sinkings, hull failures and machinery failure analysis.

Over forty years of knowledge and experience are brought to bear in following books. David Pascoe is the author of:. In addition to readers in the United States, boaters and boat industry professionals worldwide from nearly 80 countries have purchased David Pascoe's books, since introduction of his first book in We saw it coming but did not run. Secure all hatches. Close all the ports and windows because you want to keep the water outside the boat as the boat is easier to control that way.

When water starts entering a port or window, it could turn into a disastrous situation very fast. Approach wave at 45 degrees, approaching at 90 degree or angles close to that could get your boat to capsize.

Apart from that, you want your bow to be above the wave but also without blocking your view. When you encounter heavy waves, you must slow down. In fact, driving your boat at high speed through big waves can lead to broaching. This occurs when your boat travels too fast down the crest of a wave and the bow submerges under the next wave the boat encounters.

The pressure of the wave can cause the skipper to lose control of the boat as the propeller of the motor comes out of the water. When you slow down and move your boat at an angle to the wave, you can avoid broaching. If your engine goes out or you end up losing control of your boat because of no backup engine, you can use paddles to navigate out of the big waves.

You can drop your sea anchor from the bow of the boat to help keep the bow into the wind. Although you want to avoid this, by all means, it is possible to lose control of your boat and even get it capsized. This is why you must have your life jackets on while riding a big wave.

But before your boat gets capsized by the wind, fire a flare into the air to call the attention of other boaters. This is also to enhance visibility so that you can prevent collision with other boats. Call the emergency numbers to inform them of your troubles. The biggest risk when your boat capsizes is that you can get drowned. Your life jacket helps you to achieve this and you can cling to objects on board like coolers that naturally float. If your boat starts to sink, then having a tether that connects you to the boat could actually turn to a disadvantage because it could drag you downwards along with the boat.

You have to untangle yourself from anything that could make you drown. You have to remove the harness. In some cases, you can turn your vessel but that depends on how small your boat is.

A boat is far bigger than you and easier to sight that a human being floating alone. Stay close to your boat so that you can be easily sighted. Before you can start driving in big waves, you need to be a passenger of boaters who are more experienced about driving in rough conditions. Watch them see how they approach the big waves and the general precautions they take.

This will give you a real-life feel of the condition out there and knowledge of what to do and what to avoid.

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