Account menu

Marine traffic signal

Introduction/Additional information: 

This message provides information on a signal station and status of the control signal at the entrance of a harbour or channel where the shipping direction controlled so that the traffic flow be kept in order.

This message is transmitted by a competent authority.

Permitted as from: 
01/06/2010
Registrant: 
IMO Circ. 289
Physical link: 
AIS
Message number (0=VDES-VDE): 
8
DAC or VPFI: 
1
FI / Message ID: 
19
State: 
in force
Number of slots (max): 
2
Last modified: 
29/01/2021 - 23:18
Details: 

 

Table 8.1

Marine traffic signal

 

Parameter

No of bits

Description

Message ID

6

Identifier for Message 8; always 8.

Repeat Indicator

2

Used by the repeater to indicate how many times a message has been repeated.

0 - 3

0 = default

3 = do not repeat anymore

Source ID

30

MMSI number of source station.

Spare

2

Not used. Set to zero.

IAI

16

DAC =001; FI = 19

Message Linkage ID

10

A source specific running number, unique across all binary messages equipped with Message Linkage ID. Used to link additional information to the message by a Text Description message. The Message Linkage ID, source MMSI and message FI uniquely identifies the sent message.

1 - 1,023

0 = not available = default

Name of Signal

Station

120

Maximum 20 characters 6 bits ASCII, as defined in ITU-R M. 1371-3, Table 44

"@@@@@@@@@@@@@@@@@@@@" = not available = default

Position of Station,

Longitude

25

Longitude in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative).

181 = not available = default

Position of Station,

Latitude

24

Latitude in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative).

91 degrees = not available = default

Status of Signal

2

0 = not available = default

1 = In regular service

2 = Irregular service

3   reserved for future use

Signal in Service

5

(see Table 8.2)

Time of next Signal Shift

 

Time of next Signal Shift in UTC

UTC Hour

5

0 - 23

24 = not available = default

25-31 not used 

UTC Minute

6

0 - 59

60 = not available = default

61-63  not used

Expected Next Signal

5

(see Table 8.2)

Spare

102

Not used. Set to zero.

Total

360

Occupies 2 slots

 

 

Table 8.2

Signal in Service[1]

 

Value

Description

0

Not available = default

1

IALA port traffic signal 1: Serious emergency - all vessels to stop or divert according to instructions.

2

IALA port traffic signal 2: Vessels shall not proceed.

3

IALA port traffic signal 3: Vessels may proceed. One way traffic.

4

IALA port traffic signal 4: Vessels may proceed. Two way traffic.

5

IALA port traffic signal 5: A vessel may proceed only when it has received specific orders to do so.

6

IALA port traffic signal 2a: Vessels shall not proceed, except that vessels which navigate outside the main channel need not comply with the main message.

7

IALA port traffic signal 5a: A vessel may proceed only when it has received specific orders to do so; except that vessels which navigate outside the main channel need not comply with the main message.

8

Japan Traffic Signal - I = "in-bound" only acceptable.

9

Japan Traffic Signal - O = "out-bound" only acceptable.

10

Japan Traffic Signal - F = both "in- and out-bound" acceptable.

11

Japan Traffic Signal - XI = Code will shift to "I" in due time.

12

Japan Traffic Signal - XO = Code will shift to "O" in due time.

13

Japan Traffic Signal - X = Vessels shall not proceed, except a vessel which receives the direction from the competent authority.

14 - 31

(reserved for future use)

 

[1]         For further details, see IALA Recommendation E-111 on Port Traffic Signals, Edition 1.1, December 2005.