NAV_EXAM

Question 1

Enumeration

4 types of bearing

Answer 1

• true bearing
• relative bearing
• magnetic bearing
• compass bearing

Question 2

Enumeration

4 cardinal point of a compass

Answer 2

SOUTH
NORTH
EAST
WEST

Question 3

Enumeration

3 types of north

Answer 3

True north
Magnetic north
Grid North

Question 4

Enumeration

4 Errors of Magnetic Compass

Answer 4

Variation
Deviation
Inclination (Heeling)
Oscillation (Swinging)

Question 5

Multiple choice

1.) Primary cause of the earth’s magnetic field

Answer 5

Movement of molten iron and nickel in the outer core

Question 6

Multiple choice

2.) What does the term magnetic variation refer to

Answer 6

The difference between magnetic north and true north.

Question 7

Multiple choice

3.) Which part of the magnetic compass indicates the ship’s heading

Answer 7

The compass card

Question 8

Multiple choice

4.) What is the purpose of binnacle and magnetic compass system

Answer 8

To house the compass and provide an easy-to-read navigation instrument.

Question 9

Multiple choice

5.) Which error in the magnetic compass is caused by the ship’s magnetic properties.

Answer 9

Deviation

Question 10

Multiple choice

6.) What is the difference between true bearing and relative bearing

Answer 10

True bearing is from true north; relative bearing is from the ship’s heading.

Question 11

Multiple choice

7.) Which component of the compass is used to correct the deviation caused by the ships iron and steel structures

Answer 11

Compass adjustment magnets.

Question 12

Multiple choice

8.) What does the process of boxing do compass refers to

Answer 12

Correcting compass errors through known bearings.

Question 13

Multiple choice

9.) Type of error is caused by the ships inclination or lift affecting the compass

Answer 13

Heeling error.

Question 14

Multiple choice

10.) Which factor affects the heading error in a magnetic compass

Answer 14

Magnetic deviation.

Question 15

Multiple choice

11.) Which type of compass used as the Earth rotation to determine true north

Answer 15

Gyro compass.

Question 16

Multiple choice

12.) What is the mean advantage of using gyro compass over a magnetic compass

Answer 16

Unaffected by magnetic fields—provides true north.

Question 17

Multiple choice

13.) What does the gyroscopic precision phenomenon cause a gyro
Compass

Answer 17

Maintains orientation despite ship movement.

Question 18

Multiple choice

14.) Which of the following is a correct method of a gyro compass error caused by latitude

Answer 18

Latitude correction.

Question 19

Multiple choice

15.) Which error is associated with the gyro compass if there are rapid changes in the ship course or speed

Answer 19

Gyro error due to rapid changes.

Question 20

Multiple choice

16.) Which of the following method is used to obtain a table of deviation for a magnetic compass

Answer 20

Compass swinging.

Question 21

Multiple choice

17.) What is the formula to correct a gyro compass error caused by speed

Answer 21

Depends on speed and latitude adjustments.

Question 22

Multiple choice

18.) How is a deviation correcting applied in a magnetic compass

Answer 22

Using correction magnets during compass swinging

Question 23

Multiple choice

19.) What is the term for the angular difference between true north and magnetic north

Answer 23

Magnetic declination

Question 24

Multiple choice

20.) What is the purpose of deviation table in a ship navigation

Answer 24

To correct compass readings for magnetic deviations.

Question 25

# Essay About compass and it's cardinal point

Answer 25

A compass is a vital navigation instrument that shows direction using a magnetic needle that aligns with Earth's magnetic field. The four cardinal points—North, South, East, and West—are crucial for determining heading and course. Intercardinal points (NE, NW, SE, SW) enhance navigation accuracy, making it easier for navigators to plot routes and maintain orientation.

Question 26

# Essay Why is it important to keep a record of observe deviation

Answer 26

Recording observed deviation is essential for safe navigation. Deviation can cause significant heading errors, leading to dangerous situations at sea. Accurate deviation tables allow navigators to adjust compass readings, improving overall navigation safety and efficiency. Keeping a history of deviations also helps prevent future navigational errors.

Question 27

# Essay Explain the meaning of gyro least, error east, gyro best and error west

Answer 27

Gyro Least: The minimum recorded gyro error, reflecting the best accuracy. Error East: When the gyro reading exceeds true heading, requiring correction. Gyro Best: The most reliable gyro reading for navigation. Error West: When the gyro reading is below the true heading, needing adjustment for accuracy.