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Flashcards in Unit 3 Deck (47)
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Can buoys

Cylindrical-shaped. Always marked with green markings and odd numbers. They mark the edge of the channel on your port (left) side when entering from the open sea or heading upstream


Num buoys

Cone-shaped. Always marked with red markings and even numbers. They mark the edge of the channel on your starboard (right) side when entering from the open sea or heading upstream


Lighted buoys

Use lateral marker shapes, colors, and numbers discussed previously. In addition, they have a matching colored light.



Permanently placed signs attached to structures, such as posts, in the water. Common daymarks are red triangles and green squares. These may be lighted also.


Intracoatal Waterway (ICW) symbols are most commonly found in



Channels that are part of the ICW

identified by yellow symbols on channel buoys and markers


When following the ICW in a clockwise direction starting from new jersey and heading to brownsville, texas, these rules apply

Any marker displaying a yellow triangle should be passed by keeping it on the starboard (right) side of the boat. Any marker displaying a yellow square should be passed by keeping it on the port (left) side of the boat


Western Rivers System

The navigational markers aren't numbered. Numbers displayed below daymarks along the system indicate the distance from the river's mouth, these are not associated with the right or left side of the channel.


Non-lateral markers

Give information other than the edges of safe water areas. The most common our regulatory markers that are white and use orange markings and black lettering. These markers are found on lakes and rivers



Give directions and information



Warn of hazards and obstructions



Mark controlled areas


Crossed diamond

Mark exclusion (closed) areas


Safe water marker

White with red vertical stripes. Indicate on abstracted water on all sides. They mark mid-channels or stairways and maybe passed on either side.


Mooring buoy

White with blue horizontal band. Are usually placed in marinas and other areas where boats are allowed to anchor. These are the only buoys you may tie up to legally


Inland waters obstruction marker

White with black vertical stripes. Indicate an obstruction to navigation. You should not pass between these buoys and the nearest shore


Plow-style anchor

Good for most boots and get its holding power by plowing into bottom sediment


Fluke-style anchor

Similar to the plow style but is more lightweight. It is also good for most boats and get Citoyen power from its pointed flukes digging into bottom sediment


Mushroom anchor

Get its holding power by sinking into bottom sediment. It should not be used to anchor boats larger than a small canoe, rowboat, small sailboat, or inflatable boat since the holding power is weak. You should never depend on a mushroom anchor to hold your boat in rough water or weather


Prepare your anchor before setting out

Attached 7-8 feet of galvanized chain to the anchor. Helps prevent abrasion of the anchor line from sand or rock on the bottom. Be sure its strong enough to anchor your boat. Should be 7-10 times the depth of the water where you are setting anchor.



Metal fitting on which a rope can be fastened



In the direction the current is flowing



In the direction the wind it blowing



In the direction that is against the wind


Anchoring your boat

1. Select anchor with plenty of room. Should be a well-protected area with adequate water depth and a sandy or muddy bottom
2. Head slowly into wind or current to a position upwind or upcurrent of where you actually want to end up
3. Stop the boat and slowly lower the anchor over the bow to the bottom, never anchor from the stern as this can cause the boat to swamp. The square stern may be hit by waves and water will splash onto the boat. The motors weight will add to this problem.
4. Slowly back the boat away downwind or down current. Let out about 7 to 10 times as much anchor line as the depth of the water. Tie off the line around eight though cleat, and pull the anchor line to make sure that anchor is set
5. After anchoring, take visual sightings of onshore objects or buoys in the water to help you know where your boat is positioned. While at anchor recheck these sightings frequently to make sure the anger is not dragging
6. Periodically check connecting knots on your anchor line. When possible, use splices instead of knots. Knots weaken a line more than splices


Allow "swing room"

Be aware that the boat will swing downwind or down current from the anchor. Allow "swing room" for any change in wind or current


To retrieve and anchor

1. Move the boat directly over the anchor while pulling in the line. Pulling the anchor straight up should break it free
2. If the anchor is stuck, turn your boat in a large circle while keeping the anchor line pulled tight
3. When the anchor breaks loose, stop the boat and retrieve the anchor. Never drag the anchor behind the boat


Low-head dams

Surface currents below Lowhead dams can suck vessels towards the face of the dam


Low-head dams

Currents above Lowhead dams can sweep vessels over the dam


Large structure dams

More easily spotted because of their powerhouses and spillways