Section 3 - Charts

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• Welcome to the
• United States Power Squadrons'
• Chart Smart Seminar

Charts (Section 3)
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Class Agenda - cont'd

• Section 3 Charts
• Chart Scales
• What Charts Show
• Colors Used on Charts

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What Charts Show Navigators

• Directions compass rose

• Depths heights

• Obstructions channels

• Aids to navigation key landmarks

• And much more

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Colors Used on Charts
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Measuring Direction
Direction is measured from 000? to 360?
clockwise from North
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measured north and south from the equator
Latitude
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measured east and west from the prime meridian at
Greenwich, England
Longitude
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Measuring Latitude and Longitude
One minute of latitude equals one nautical mile
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How Chart Scales Differ
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How Chart Scales Differ
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Chart Scales
Large Scale Chart Shows A Small Area
Small Scale Chart Shows a Large Area
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Chart Work Class Exercise 1
Using the Bowditch Bay practice chart, measure
the Latitude and Longitude of
G C "1" at Shark River L
___________________
Lo __________________ RG
D Fl R Gong L
___________________ Lo
__________________ R 6 Fl R off Channel I
L ___________________ Lo
__________________ R N 2 at Perkins Cove
L ___________________ Lo
__________________
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Chart Work Class Exercise 1
Using the Bowditch Bay practice chart, measure
the Latitude and Longitude of
G C "1" at Shark River L
___________________
Lo __________________ RG
D Fl R Gong L
___________________ Lo
__________________ R 6 Fl R off Channel I
L ___________________ Lo
__________________ R N 2 at Perkins Cove
L ___________________ Lo
__________________
41 42.0' N
071 31.1' W
41 46.3' N
071 19.7' W
41 40.3' N
071 19.8' W
41 36.2' N
071 15.4' W
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End of Section 3
Charts