EO X51.04 Locate a position on a chart

EO X51.04 Locate a position on a chart

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Multiple Choice

This navigational tool measures the height of the horizon to an object in space to help explorers plot their location.

• astrolabe

• compass

• sextant

• telescope

Speed Distance Time

Review

Multiple Choice

Speed = ?

• $$Dis\tan ce\ \ \div\ Time$$

• $$Dis\tan ce\ \times\ Time$$

• $$Time\ \div\ Dis\tan ce$$

• $$Time\ +\ Dis\tan ce$$

Multiple Choice

Time = ?

• $$Dis\tan ce\ -\ Speed$$

• $$Speed\ \div\ Dis\tan ce$$

• $$Dis\tan ce\ \times\ Speed$$

• $$Dis\tan ce\ \div\ Speed$$

Multiple Choice

Distance = ?

•   $$Speed\div Time$$  

• $$Speed\ \times\ Time$$  

• $$Time\ \div\ Speed$$  

• $$Time\ +\ Speed$$  

Multiple Choice

What is the name of the line at zero degrees longitude?

• Equator
• Prime Meridian
• North Pole
• South Pole

Multiple Choice

What is the name of this line at 0 degrees latitude?

• Prime Meridian
• Equator
• North Pole
• South Pole

Multiple Choice

Lines of ______ measure how far from the equator a place is located?

• Longitude
• Latitude

Multiple Choice

Lines of Longitude run from the _____ to the ______.

• East, West
• North, South
• South, East
• North, West

Multiple Choice

• The map show the lines of longitude.
• The map shows the lines of latitude.

Multiple Choice

• The map shows lines of longitude.
• The map shows lines of latitude.

Multiple Select

Select correct statements.

• Latitudes are imaginary lines

• Latitudes are vertical lines

• Latitudes are point sized at the poles

• Latitudes are measured in degrees.

Multiple Choice

To locate the exact places on Earth, one must look at: 

• latitude lines only
• the intersecting lines of latitude and longitude
• longitude lines only
• a neighboring area to describe the location

2 methods to determine latitude and longitude coordinates

1. Slide Ruler

2. Dividers

Determine Latitude Coordinate

The technique for using a parallel ruler to find the latitude is as follows:

1. Align the edge of the parallel ruler along the nearest parallel of latitude on the chart. In this example, the

ruler must be placed so that its left end intersects the latitude scale on the left side of the chart.

2. Roll the ruler to the light's symbol so that the black dot of the symbol falls along the edge of the ruler.

Using the ruler as a guide, draw a light line on the latitude scale where the ruler intersects the scale.

3. Read and record the latitude of the object (in this case the latitude is 48° 44.58' N).

Determine Longitude Coordinate

The technique of determining the longitude of a point using a parallel ruler is as follows:

1. Place the edge of the parallel ruler along a meridian of longitude or along the longitude scale on the left

side of the chart.

2. Roll the ruler to the light symbol so that the black dot of the symbol falls along the edge of the ruler. Using

the ruler as a guide, draw a light line on the longitude scale at the top of the chart where the ruler intersects it.

3. Read and record the longitude of the object (in this case the longitude is 123° 34.20' W).

Determine Latitude Coordinates

The technique of determining latitude using a set of dividers is as follows:

1. Align the edge of the parallel ruler with a meridian of longitude nearest Separation Pt.

2. Roll the ruler to the symbol so that the black dot at the bottom falls along the edge of the ruler.

3. Using the edge of the ruler as a guide, measure the distance from the symbol to the nearest parallel of

latitude (in this case it is 48° 44' N).

4. Move the dividers to the latitude scale on the left side of the chart. Place one point on the same parallel

(48° 44' N) and measure up the scale (as Separation Pt. is north of this parallel).

5. Read and record the latitude of the light (48° 44.58' N).

Determine Longitude Coordinate

The technique of determining longitude using a set of dividers for the same point is as follows:

1. Align the edge of the parallel ruler with the parallel of latitude nearest Separation Pt.

2. Roll the ruler to the symbol so that the black dot at the bottom falls along the edge of the ruler.

3. Using the edge of the ruler as a guide, measure the distance from the symbol to the nearest meridian

of longitude (in this case it is 123° 36' W).

4. Move the dividers to the longitude scale on the top of the chart. Place one point on the same meridian

(123° 36' W) and measure along the scale to the right (as Separation Pt. is east of this meridian).

Multiple Select

Which 2 errors need to be considered in order to get our compass back to True North?

• Deviation

• Variation

• Magnetic

• Gyro

Multiple Choice

The Deviation is the angle from?

• True North to Magnetic North
• True North to Compass North
• Magnetic North to True North
• Magnetic North to Compass North

Multiple Choice

True Track = 050°, Variation = 005°W, Magnetic Track = ?

• Magnetic Track = 045°
• Magnetic Track = 050°
• Magnetic Track = 055°

Multiple Choice

True Track = 050°, Variation = 005°E, Magnetic Track = ?

• Magnetic Track = 045°
• Magnetic Track = 050°
• Magnetic Track = 055°

Multiple Choice

What is the definition of Variation?

• The angular difference from True North to Compass North

• The angular difference from True North to Magnetic North

• The angle from Magnetic North to Compass North.

• The distance between Magnetic North and Geographic Poles