Signal Lights message

Introduction/Additional information:

.1.1              Introduction:

This message should be sent from shore only, to inform about the status of different light signals to all vessels in a certain area. The information should be displayed on an external display such as Inland ECDIS 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.

1.1.2              Additional Information:

  • This message should only been send by a competent/waterway 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.

Message number:
Number of slots (max):
Reporting Rate:
Initiated from shore
Permitted as from:
Technical point of contact:


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 4‑1
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 4‑1, 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