AIS

Question 1

What is AIS?

Answer 1

Automatic identification system -

• Is an autonomous VHF transceiver based line of sight 30 - 40 nm
• Transmits data from ship to ship when in range and transmits ship to shore

Question 1

class A receivers

(required vessels)

Answer 1

• class A receivers required for all SOLAS vessels
• All vessels over 300 GT on international voyages
• cargo vessels over 500 gt
• all passenger vessels

Question 2

Class A message data

Answer 2

every 2 seconds to 3 minutes if moored

• position
• course
• SOG
• rate of turn

Question 3

Class A message data

(Voyage Data)

Answer 3

Every six minutes -

• Destination
• ETA
• Cargo/type class
• POB

Question 4

Class A message data

(Static data)

Answer 4

Every six minutes -

• IMO ship identity/MMSI
• International radio call sign
• Name
• principal dimensions
• location of positioning system
• type of positioning system

Question 5

what is SOTDMA?

Answer 5

Self Organising Time Division Multiple Access

• Allocates Class A vessels a future transmission spot.