Water levels

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
Registrant: 
EU
Message number: 
8
DAC: 
200
FI: 
24
Technical point of contact: 

RIS VTT

State: 
in force
Number of slots (max): 
1