Lat & lon & plotting on a chart 2008

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CHARTING OCEAN LOCATIONS Robert Perry Malibu High School


0O longitude the prime meridian (Greenwich, England)

0O latitude the equator


O

 longitude runs from 0 to 180 east and west 

O

equator

O

prime meridian

http://cse.ssl.berkeley.edu

 latitude runs from 0 to 90 north and south 

O


at sea, a

GPS tells us the latitude & longitude of our position


WHAT DOES THE NAUTICAL CHART TELL YOU ?


1. LOCATION OF LAND AND LANDMARKS.


2. LOCATION OF OCEAN AND DEPTHS.


DEPTHS ARE SHOWN in FATHOMS 1 fm = 6 ft

2. LOCATION OF OCEAN AND DEPTHS.


3. LATITUDE (horizontal scale)


O

34 30’ N

O

34 20’ N DEGREES of LATITUDE GET BIGGER GOING NORTH (up) O

34 10’ N 3. DEGREES OF LATITUDE (horizontal scale).


4. DEGREES OF LONGITUDE (vertical scale).


4. DEGREES OF LONGITUDE (vertical lines). DEGREES of LONGITUDE GET BIGGER GOING WEST (left)


we record positions: O

119 54.513’ W degrees, minutes, and decimals of minutes (60’ = 1 ) O


Let’s do a practice plot ! O

Lat 34 21.449’ N Lon 119 49.251’ W O


O

34 21.449’ N our point !

O

119 49.251’ W


Let’s try another one! O

Lat 34 17.001’ N Lon 119 35.003’ W O


X p1

O

34 17.001’ N our 2nd point !

O

119 35.003’ W


X p1

X p2

finished chart with points plotted


Now, a quiz! plot: O

Lat 34 01.501’ N Lon 119 32.303’ W O


X p3


the end


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