THE BASICS OF PLOTING OCEAN LOCATIONS the GPS LATITUDE & LONGITUDE Robert Perry.

THE BASICS OF PLOTING

OCEAN LOCATIONS

the GPSLATITUDE &LONGITUDE

Robert Perry

DISCLAIMER:

The images, maps and diagrams inthis presentation were taken from

the public domain on the world wide web. This slide show is for non-

commercial, educational purposesONLY !

e-mail: [email protected]

LATITUDE & LONGITUDE LINES:

LATITUDELines go eastand west.

LONGITUDELines go northand south.

Map: http://worldatlas.com/aatlas/imageg.htm

http://worldatlas.com/aatlas/imageg.htm

a GLOBAL POSITIONINGSATELLITE RECEIVER isused to measure and recordthe LATITUDE andLONGITUDE of aLOCATION in DEGREES,and MINUTES.

LATITUDE

LONGITUDE

latitude34O 06.54’ N

Degrees

Minutes

North ofequator

Ground Tracks for the27 Global Positioning Satellites (effective 9/28/98)

At least 4 GPSatellites must be locked in to giveLatitude, Longitude, Elevation and GPS Time.

X Y Z & T

SAMPLE ACTIVITY:

PLOT THE POSITIONS OF A FEWLOCATIONS ON A CHART

Materials needed for this sample activity:

Copies of Santa Monica Bayor southern California chart

pencils

Ruler or straight-edge

Location data(from GPS)

STEPS TO FOLLOW IN THIS ACTIVITY:

1- FIND THE LATITUDE LINE ANDDRAW IT IN PLACE USING YOURPENCIL AND RULER.

2- FIND THE LONGITUDE LINE ANDDRAW IT IN PLACE USING YOURPENCIL AND RULER

3. PLACE AN “X” TO MARK THE SPOT WHERE LATITUDE AND LONGITUDE LINES CROSS.

Our activityarea

WHAT DOES THE NAUTICAL CHART TELL YOU ?

1. LOCATION OF LAND AND LANDMARKS.

2. LOCATION OF OCEAN AND DEPTHS.

2. LOCATION OF OCEAN AND DEPTHS.

DEPTHS ARESHOWN

BY DARKERCOLORS

3. DEGREES OF LATITUDE (horizontal lines).

3. DEGREES OF LATITUDE (horizontal lines).

DEGREES ofLATITUDE

GET BIGGERGOING NORTH

4. DEGREES OF LONGITUDE (vertical lines).

4. DEGREES OF LONGITUDE (vertical lines).

DEGREES ofLONGITUDEGET BIGGERGOING WEST

NOTICE THAT THE GRIDLINES ON THIS CHART AREEQUAL TO 5’ (minutes) EACH.

SAMPLE PROBLEM #1:LOCATE THE SANTA MONICA PIER

GIVEN: THE SANTA MONICA PIER IS LOCATED AT34O 00.50’N and 118O 29.10’W


First, we’lldraw the

LATITUDELINE

using yourruler and a

pencil.


34O 00.50’N(green line)is just a tinybit North of34O 00.00’N


34O 00.50’N[our location is

someplace alongthis green line]


Next, let’sdraw the

LONGITUDELINE

using yourruler and a

pencil.


118O 29.10’W(yellow line)is just a tiny

bit before118O 30.00’W


The SantaMonica Pier

is located wherethe two lines

cross each other.


“X” marksthe spot !

X

SAMPLE PROBLEM #2:LOCATE THE MANHATTAN BEACH PIER

X

GIVEN: THE MANHATTAN BCH. PIER IS LOCATED AT33O 53.00’N and 118O 24.90’W

X


33O 53.00’ is between 33O 50’

and 33O 55’

X


X


LAT andLON cross

here

X



X

X

X

X

SAMPLE PROBLEM #3:LOCATE THE ZUMA BEACH, MALIBU

X

X

GIVEN: ZUMA BEACH, MALIBU IS LOCATED AT34O 01.25’N and 118O 49.50’W

X

X


LAT andLON cross

here

X

X



X

SUMMARY:

TO PLOT A LOCATION ON A CHART

1. FIND THE LATITUDE LINE

2. FIND THE LONGITUDE LINE

3. PLACE AN “x” WHERE THE TWOLINES CROSS

THE BASICS OF PLOTING OCEAN LOCATIONS the GPS LATITUDE & LONGITUDE Robert Perry.

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