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Signal Station

Introduction/Additional information:

Introduction:

This message should be sent from a competent authority only, to inform about the status of different light signals at signal stations to all vessels in a certain area. The information should be displayed on an external display such as Inland ECDIS application as dynamic symbols. This message is an updated version of the “Light status message” (FI40) which cannot be updated due to the lack of a version indicator.

Additional Information:

This message should only been send by a competent authority from shore only. The message should be sent at regular intervals.
The ISRS code indicates the position of the signal and shall allow the match with the IECDIS display. It consists of UN country code, Fairway section number, Object code and fairway hectometre and is derived from the RIS Index as published in the ERDMS. The object code is used in a reduced way. The first two characters of the ISRS code for signal stations which are always “Si” are not transmitted. The type of traffic signal station and the number of signal station according to the RIS Index encoding guide are transmitted separately using the codification given in the table below. The IENC application has to recover the ISRS code and match it with the right ISRS code of the IENC, taking into consideration that the UN location code is missing.
The light status is coded from left to right from light signal 1 to 9

Permitted as from:

24/11/2016

Registrant:

EU

Physical link:

AIS

Message number (0=VDES-VDE):

8

DAC or VPFI:

200

FI / Message ID:

41

Version:

0

Technical point of contact:

RIS-VTT

State:

in force

State link:

Signal status

Number of slots (max):

1

Last modified:

29/01/2021 - 23:19

Reporting Rate:

Initiated from shore

Details:

Structure:

	Parameter	Bit	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. Default = 0; 3 = do not repeat any more
	Source ID	30	MMSI number
	Spare	2	not used, should be set to zero
Binary data	Application Identifier	16	DAC = 200, FI = 41
	Version indicator	3	The version number of the message default = 0, rest for future use
	UN country code	12	2*6 Bit characters, digits 1 and 2 of the ISRS code
	Fairway section number	17	bit coded numerical value 1-99999, 0=unknown, rest not used, digits 6 to 10 of the ISRS code
	Object reference code - type of signal station	3	0-7; 0 = default = unknown, 1 = sistat_8 (Bridge), 2 = sistat_6 (Lock), 3 = sistat_10 (Traffic), 3 = sistat_2 (Port), rest reserved for future use not used, digits 13 and 14 of the ISRS code
	Object reference code - number of signal station	4	0-16; 0-9 = number of signal station, 10 = default = unknown, rest not used, digit 15 of the ISRS code
	Fairway hectometre	17	bit coded numerical value 1-99999, 0=unknown, rest not used, digits 16 to 20 of the ISRS code
	Signal form	4	0-15, 0 = unknown = default, 1-14 signal form according to Figure 3‑1
	Orientation of signal	9	0-511, 0 – 359 = orientation in degrees, 511 = not available = default, rest not used
	Direction of impact	3	1 = upstream, 2 = downstream, 3 = to the left bank, 4 = to the right bank, 0 = unknown = default, rest not used
	Light Status	30	Status (1 to 7) of up to 9 lights per signal according to Figure 3‑1, 0 = default = unknown, 8-9 not used, 000000000 = default, 777777777 maximum, rest not used
	Spare	10	not used. Should be set to zero
	Total	168	occupies 1 slot

Reference tables:

The examples show a grey background in a square of a fixed size of about 3 mm x 3 mm at all display scales with a “post” like it is used for the present static signal in the presentation library. The white point in the centre of the post indicates the position and the post itself allows the user to read the direction of impact. (At a lock, for example, there are often signals for vessels leaving the lock chamber and vessels entering the lock chamber on the inner and the outer side of the door construction) However, the manufacturer of the display software can design the shape of the symbol and the background colour.

The status of a signal can be “No light”, “white”, “yellow”, “green”, “red”, “white flashing” and “yellow flashing” according to CEVNI.