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