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Published byTyler Harry Booth Modified over 9 years ago
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Direction is measured from 000 to 360 clockwise from North
Measuring Direction Direction is measured from 000 to 360 clockwise from North South = 180 West = 270 North - 000/360 East = 090 B
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LATITUDE B
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Longitude B
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Measuring Latitude and Longitude
One minute of latitude equals one nautical mile B
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HOW CHART SCALES DIFFER
B
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CHART SCALES Small Scale chart Large Scale Chart Small scale charts
show large areas Large scale charts show small areas B
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CHART SCALES B
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“MARK” AN AID TO NAVIGATION YOU SEE WHILE BOATING
TWO CATEGORIES OF MARKS Lateral Marks Marks starboard and port sides of a route Non-Lateral Marks Supplemental aids having no lateral significance BS B
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IDENTIFICATION OF “MARKS”
In Daylight Shapes Colors Numbers or letters Sounds At Night Light color and patterns Always Locate Marks On Your Chart BS B
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TYPES OF “MARKS” BUOYS BEACONS
Floating marks anchored at specific locations BEACONS Fixed marks permanently fastened to the earth’s surface BS B
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“BUOYS” Floating Aids Position approximate Identified by Chart symbol
Various shapes and colors Position approximate Identified by Number, letters, sound devices and lights Chart symbol diamond with a small position circle Magenta disc around position circle, if lighted BS B
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“BEACONS” Permanently fixed to Earth's surface Examples:
Lighthouses Daybeacons Identified by: Numbers, letters, sound devices, lights Chart symbols: Unlighted - small triangle or square Lighted - magenta flare with a black position dot BS B
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The “3-R” Rule Red - Right - Returning
When Returning from sea, keep red side-of-channel marks to your starboard “Returning” is: Entering a harbor or bay from the open ocean Traveling up a river from the sea Traveling clockwise around the U.S. along it’s coastline South along the Atlantic coast West along the Gulf coast North along the Pacific coast BS B
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TYPES OF SOUND SIGNALS BS B
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Definitions Navigation Piloting
The science of directing the movements of a boat from one place to another in a safe and efficient manner. Piloting A part of navigation using landmarks, navigational aids, and soundings as primary tools. B
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Variation is found in the center of the compass rose
A Chart Compass Rose Variation is found in the center of the compass rose B
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