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Water level message

Introduction/Additional information: 

Introduction:

This message should be used to inform skippers about actual water levels in their area. It is additional short term information to the water levels distributed via Notices to Skippers. The update rate shall be defined by the competent authority. It is possible to transmit the water levels of more than 3 gauges using multiple messages.

Additional Information:

  • This message should be sent from shore only, to give water level information to all vessels in a certain area. The message should be sent at regular intervals.

  • The UN country code and the national unique gauge ID shall be derived from the RIS Index of published in the European Reference Data Management System (ERDMS).

  • The water level data shall only be broadcasted for gauge stations which are included in the European RIS Index.

  • Consequently the display on board shall also only be done in cases where the message can be successfully linked to the RIS Index gauge object(s).

Permitted as from: 
18/10/2020
Registrant: 
EU
Physical link: 
AIS
Message number (0=VDES-VDE): 
8
DAC or VPFI: 
200
FI / Message ID: 
26
Version: 
0
Technical point of contact: 

RIS VTT

State: 
in force
State link: 
Water level message
Number of slots (max): 
1
Last modified: 
19/01/2023 - 14:38
Reporting Rate: 

This message should be sent from shore only, to give water level information to all vessels in a certain area. The message should be sent at regular intervals.

Details: 
  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. Reserved for future use.
Binary data Application Identifier 16 DAC = 200, FI = 26
Version indicator 3 The version number of the message default = 0, rest for future use
UN country code 12 UN country code using 2*6-Bit ASCII characters; 0 = not available = default
Gauge ID 1 11 National unique ID of gauge in RIS Index
1-2047, 0 = default = unknown
Water level reference 1 3 0=value of gauge=default, 1=relative to RIS Index reference value 1, 2=relative to RIS Index reference value 2, 3=relative to RIS Index reference value 3; 4=relative to zero point in RIS Index, rest reserved for future use
Water level value 1 17 -65535 to 65535 cm (as per 2’s complement),
-65536=unknown=default
Gauge ID 2 11 National unique ID of gauge in RIS Index
1-2047, 0 = default = unknown
Water level reference 2 3 0=value of gauge=default, 1=relative to RIS Index reference value 1, 2=relative to RIS Index reference value 2, 3=relative to RIS Index reference value 3; 4=relative to zero point in RIS Index, rest reserved for future use
Water level value 2 17 -65535 to 65535 cm (as per 2’s complement),
-65536=unknown=default
Gauge ID 3 11 National unique ID of gauge in RIS Index
1-2047, 0 = default = unknown
Water level reference 3 3 0=value of gauge=default, 1=relative to RIS Index reference value 1, 2=relative to RIS Index reference value 2, 3=relative to RIS Index reference value 3; 4=relative to zero point in RIS Index, rest reserved for future use
Water level value 3 17 -65535 to 65535 cm (as per 2’s complement),
-65536=unknown=default
Spare 4  
  Total 168 occupies 1 slot