1. United States Power Squadrons'
Welcome to the
United States Power Squadrons'
Chart Smart Seminar
Charts
(Section 3)

2. Class Agenda - cont'd Section 3: Charts Chart Scales What Charts Show
Colors Used on Charts

3. What Charts Show Navigators
Directions & compass rose
Depths & heights
Obstructions & channels
Aids to navigation & key landmarks
And much more …

6. 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

7. 

8. 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

9. measured north and south from the equator
Latitude
measured north and south from the equator

10. measured east and west from the prime meridian at Greenwich, England
Longitude
measured east and west from the prime meridian at Greenwich, England

11. Measuring Latitude and Longitude
One minute of latitude equals one nautical mile

12. How Chart Scales Differ

13. How Chart Scales Differ

14. Small Scale Chart Shows Large Scale Chart Shows
Chart Scales
Small Scale Chart Shows
a Large Area
Large Scale Chart Shows
A Small Area

15. 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 ___________________

17. 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

18. End of Section 3
Charts