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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 4 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 ISRS code of the gauge station code as part of the RIS Index published in the European Reference Data Management System (ERDMS).
  • The water level information shall be coded as the difference value of the gauge to the reference water level (e.g. GlW in Germany, RNW on the Danube) as positive or negative value. The Least significant Bit (LSB) of the water level code is used to indicate if the water level is higher or lower as the reference water level. Therefore the definition is different to the usual bit-coding of integer values.
Permitted as from: 
10/10/2007
Not to be used after: 
18/10/2021
Registrant: 
EU
Physical link: 
AIS
Message number (0=VDES-VDE): 
8
DAC or VPFI: 
200
FI / Message ID: 
24
Technical point of contact: 

RIS VTT

State: 
deprecated
State link: 
Water level message
Number of slots (max): 
1
Last modified: 
19/01/2023 - 14:37
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 As described in Table 2.6
UN country code 12 UN country code using 2*6-Bit ASCII characters; 0 = not available = default
Gauge ID 11 National unique ID of gauge
1-2047, 0 = default = unknown
Water level 14 Bit 0: 0 = negative value, 1 = positive value
Bits 1-13: 1-8191, in 1/100m, Bits 0-13: 0 = unknown = default
Gauge ID 11 National unique ID of gauge
1-2047, 0 = default = unknown
Water level 14 Bit 0: 0 = negative value, 1 = positive value
Bits 1-13: 1-8191, in 1/100m, Bits 0-13: 0 = unknown = default 
Gauge ID 11 National unique ID of gauge
1-2047, 0 = default = unknown
Water level 14 Bit 0: 0 = negative value, 1 = positive value
Bits 1-13: 1-8191, in 1/100m, Bits 0-13: 0 = unknown = default
Gauge ID 11 National unique ID of gauge
1-2047, 0 = default = unknown
Water level 14 Bit 0: 0 = negative value, 1 = positive value
Bits 1-13: 1-8191, in 1/100m, Bits 0-13: 0 = unknown = default
  Total 168 occupies 1 slot