Lat & lon & plotting on a chart 2008

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