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):

DAC or VPFI:

FI / Message ID:

State:

in force

Number of slots (max):

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.