Compass course and bearing correction (FINALS)

Question 1

bearings measured with reference to the ship’s longitudinal axis

Answer 1

Relative Bearings (R)

Question 2

bearings measured with respect to magnetic north.

Answer 2

Magnetic Bearings (M)

Question 3

bearings measured with respect to true of geographic north.

Answer 3

True Bearings (T)

Question 4

a special bearing denoting the direction in which the ship is pointing.

Answer 4

Ship’s Head (or heading)

Question 5

The compass consists of a _, graduated with _degreed around the face.

Answer 5

circular card, 360

Question 6

A pair of magnets is attached to the underside of the card, beneath the _

Answer 6

north-south axis.

Question 7

The _floats in the fluid to reduce friction and dampen the vibrations caused by ship’s movement.

Answer 7

card

Question 8

Advantages of Magnetic Compasses

Answer 8

• Little maintenance required* No power source required* Durability

Question 9

Disadvantages of Magnetic Compasses

Answer 9

• Does not seek True North* Affected by surrounding materials* Cannot be used near the poles

Question 10

the angle between a magnetic line of force and a geographic (true)meridian at any location on the earth

Answer 10

Variation

Question 11

exists because the earth’s magnetic and geographic poles are not co-located.

Answer 11

Variation

Question 12

also contribute to variation

Answer 12

Magnetic anomalies in the earth’s crust

Question 13

Notice that the two poles aren’t together.The magnetic compass points to the magnetic pole, and this gives us

Answer 13

VARIATION

Question 14

Used to Determine Magnetic and True Courses.

Answer 14

COMPASS ROSE

Question 15

Outer ring of compass rose is in

Answer 15

True

Question 16

Inner ring of compass rose is in

Answer 16

Magnetic

Question 17

for any given locality is shown on the compass rose of the chart for that area, together with the amount of annual increase or decrease

Answer 17

Variation

Question 18

changes from year to year as the earth’s magnetic poles tend to wander.

Answer 18

Variation

Question 19

the angle between the actual magnetic meridian and the north line on the compass card.

Answer 19

Deviation

Question 20

is caused by the interaction of the ship’s metallic structure and electrical systems with the earth’s magnetic field.

Answer 20

Deviation

Question 21

can be compensated for but never eliminated.

Answer 21

Deviation

Question 22

is used, which provides the value of deviation for every 15 degrees of ship’s head

Answer 22

compass table

Question 23

is located at the top of the mast to remove metallic effects of the hull.

Answer 23

Antennae

Question 24

Allows Deviation to be “Zeroed” by

Answer 24

auto-compensation

Question 25

Guides to Magnetic North

Answer 25

Digital Flux Gate Compass

Question 26

Variation may be manually or automatically entered

Answer 26

Digital Flux Gate Compass

Question 27

Allows Deviation to be “Zeroed” by auto-compensation

Answer 27

Digital Flux Gate Compass

Question 28

Antennae is located at the top of the mast to remove metallic effects of the hull

Answer 28

Digital Flux Gate Compass