L05

Question 1

Does AIS require no updated or manual input?

Answer 1

No

Question 2

Is AIS considered to be an aid to navigation in conjunction with other means of navigation?

Answer 2

Yes

Question 3

What information is provided to navigational aids fitted with AIS?

Answer 3

Real time weather tide and current information.

Question 4

When AIS is in assigned mode, can the shore station send DGPS corrections?

Answer 4

No.

Question 4

What operational limits is ARPA subject to that AIS can overcome?

Answer 4

Detection of AIS within blind radar sector.
Detection of AIS equipped target within high ground.
Detection of AIS in rain.
(All of the above)

Question 5

When should safety information be updated?

Answer 5

As required.

Question 6

What frequency does AIS operate in?

Answer 6

VHF

Question 7

In assigned mode the data transmission intervals and time slots are set by authorities?

Answer 7

Yes

Question 8

What all needs to be checked when looking over the magnetic compass?

Answer 8

• Appearance
• Liquid
• Correctors
• Compass bowl/card.
• Gimbal system.
• Lens and associated mirrors.
• Checking lamps.
• Position of corrector magnets.

Question 9

What must be checked when looking at the magnetic compass’ appearance?

Answer 9

• Leakage
• Damage
• Lights
• Mirrors

Question 9

What must be checked when looking at the magnetic compass’ liquid?

Answer 9

• For any bubbles.
• The colour

Question 10

What must be checked when looking at the magnetic compass’ bowl and compass card?

Answer 10

• Liquid colour
• Bubbles
• Leakages
• Mechanical damage.
• Condition of card.
• Freedom of card to rotate and move evenly.

Question 11

What must be checked when looking at the magnetic compass’ lenses and associated mirrors?

Answer 11

• Lenses are clean and clear.
• The mirror is free to adjust (angle of tilt).
• There is an unobstructed view of the compass card and that is clear to read.

Question 12

What must be checked when looking at the magnetic compass’ lamps?

Answer 12

• Check the power supply is working and in good order, no corrosion in the bulb holders.
• Lamps are in good working order and that the compass card can be visible at night.
• The dimmer control functions/sliding light gate is operating properly.

Question 13

What must be checked when looking at the magnetic compass’ position of corrector magnets?

Answer 13

• All weather seals on corrector magnets are in place and in good condition.
• Corrector magnets are in place according to the deviation card entry at last correction entry in company book.
• Flinders bar container is weather tight and in good order.
• Spheres are secure and tight and in the position as per last correction recorded.

Question 14

What is the Gaussian Error?

Answer 14

• Due to Earth’s magnetic fields being cut when the vessel Alters course.
• Ship swinging to port compass deflected to the right.
• Ship swinging to stbd compass deflected to the left.
• After vessel steadies the course errors should diminish.

Question 14

What is the retentive error?

Answer 14

• A vessel on a steady course for a considerable time.
• Magnetic change occurs due to vibration.
• Vessel then changes course the magnetic change is retained for some time.

Question 15

Where are the soft iron correctors located?

Answer 15

• Horizontal soft iron correctors (Kelvin balls) are located either side of the binnacle.
• Vertical soft iron of the ship is the funnel and this corrected by the flinders bar running vertically on the back of the binnacle.