United States Power Squadrons' Welcome to the United States Power Squadrons' Chart Smart Seminar Charts (Section 3)
Class Agenda - cont'd Section 3: Charts Chart Scales What Charts Show Colors Used on Charts
What Charts Show Navigators Directions & compass rose Depths & heights Obstructions & channels Aids to navigation & key landmarks And much more …
Colors Used on Charts White Deep, safe water Blue Shallow water Green Areas covered at high water, bare at low water; and, green buoys Gold Dry land above mean high water Magenta Lighted aids, boundary lines for special areas
Direction is measured from 000 to 360 clockwise from North Measuring Direction Direction is measured from 000 to 360 clockwise from North West = 270 East = 090 North = 000 / 360 South = 180
measured north and south from the equator Latitude measured north and south from the equator
measured east and west from the prime meridian at Greenwich, England Longitude measured east and west from the prime meridian at Greenwich, England
Measuring Latitude and Longitude One minute of latitude equals one nautical mile
How Chart Scales Differ
How Chart Scales Differ
Small Scale Chart Shows Large Scale Chart Shows Chart Scales Small Scale Chart Shows a Large Area Large Scale Chart Shows A Small Area
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 ___________________ R “6” Fl R off Channel I L ___________________ R N “2” at Perkins Cove L ___________________
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 ___________________ R “6” Fl R off Channel I L ___________________ R N “2” at Perkins Cove L ___________________ 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
End of Section 3 Charts