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Flash Cards > NAV_EXAM > Flashcards

NAV_EXAM Flashcards

1
Q

Enumeration

4 types of bearing

A
  • true bearing
  • relative bearing
  • magnetic bearing
  • compass bearing
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2
Q

Enumeration

4 cardinal point of a compass

A

SOUTH
NORTH
EAST
WEST

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3
Q

Enumeration

3 types of north

A

True north
Magnetic north
Grid North

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4
Q

Enumeration

4 Errors of Magnetic Compass

A

Variation
Deviation
Inclination (Heeling)
Oscillation (Swinging)

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5
Q

Multiple choice

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

A

Movement of molten iron and nickel in the outer core

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6
Q

Multiple choice

2.) What does the term magnetic variation refer to

A

The difference between magnetic north and true north.

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7
Q

Multiple choice

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

A

The compass card

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8
Q

Multiple choice

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

A

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

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9
Q

Multiple choice

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

A

Deviation

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10
Q

Multiple choice

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

A

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

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11
Q

Multiple choice

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

A

Compass adjustment magnets.

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12
Q

Multiple choice

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

A

Correcting compass errors through known bearings.

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13
Q

Multiple choice

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

A

Heeling error.

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14
Q

Multiple choice

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

A

Magnetic deviation.

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15
Q

Multiple choice

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

A

Gyro compass.

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16
Q

Multiple choice

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

A

Unaffected by magnetic fields—provides true north.

17
Q

Multiple choice

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

A

Maintains orientation despite ship movement.

18
Q

Multiple choice

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

A

Latitude correction.

19
Q

Multiple choice

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

A

Gyro error due to rapid changes.

20
Q

Multiple choice

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

A

Compass swinging.

21
Q

Multiple choice

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

A

Depends on speed and latitude adjustments.

22
Q

Multiple choice

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

A

Using correction magnets during compass swinging

23
Q

Multiple choice

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

A

Magnetic declination

24
Q

Multiple choice

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

A

To correct compass readings for magnetic deviations.

25
Q

Essay

About compass and it’s cardinal point

A

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.

26
Q

Essay

Why is it important to keep a record of observe deviation

A

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.

27
Q

Essay

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

A

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.

Flash Cards (10 decks)

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