Another clue comes from current action, which is usually related to the tidal state.
Current tends to flow faster where the water is deepest. You will often find back eddies and/or whirlpools along with abrupt transitions or shelving in water depth.
Rocks and small areas of shoals also create disturbances with cur-rent.There will frequently be a line of turbulence at a shallow ledge or where the bottom takes a turn.
Standing waves will be set up as the water moves around obstructions. If the obstruction is several feet below the surface, the sign of its presence may be no more than a light swirl—but it will be there.
Even the big guys make mistakes. This ship wandered out of the channel and hit a small rock, which punched a small hole. Somehow in the ensuing salvage attempt a fire started and now here she sits. Because of the mangroves, water clarity was lacking.
Is this just a rock (under black arrow) or is it a wider reef? The small wavelets on either side indicate that the shallow water extends quite a ways from the rock. This is at quarter tide. At high tide this rock will be covered with 6 feet (1.8 meters) of water. With a current running, it will show boils at the surface. But at high slack water, nothing will show.
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The development of surface disturbance gives some indication of the shape of the obstruction below. A quick change at the surface means a sharp underwater change as well. With a steep rock or bank the surface won't break until the waves are very close in.
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Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.