Water Flow Message (Seaway)

Registrant: 
Saint Lawrence Seaway Development Corporation
Message number: 
6
DAC: 
316
FI: 
1
State: 
in force
Used by: 
Saint Lawrence Seaway Development Corporation
Number of slots (max): 
5
Reporting Rate: 
Each individual Seaway message has an assigned update interval established by the Seaway Traffic Management System (TMS). However, the AIS network may elect to retransmit any messages, system resources permitting, at more frequent intervals.
Permitted as from: 
09/03/2002
Technical point of contact: 

U.S. Department of Transportation 
John A. Volpe 
Transportation Systems Center
55 Broadway 
Cambridge, MA 02142

Details: 

 

 Parameter    Number of bits    Description  
Designated Area
Code
10 The Designated Area Code will be 366 for the United States or 316 for
Canada depending on the location of transmitter.
Refer to Section 1.1 for description

Function Identifier

6 FI=1
 Reserved   2   
 Message ID   6  Message Identifier = 6 (00 0110 in binary)  
 Binary Data    Max 864    Message contains 1 to 6 water level reports, each structured as defined in next table.
 Total Number of bits    Max 888    = 24 + N*144     
       N Total Bits    (Slots Required)  
       1 168 bits    (2 slots)  
       2 312 bits    (2 slots)  
       3 456 bits    (3 slots)  
       4 600 bits    (4 slots)  
       5 744 bits    (4 slots)  
       6 888 bits    (5 slots)  

Water Flow Report

 Parameter    Number of bits    Description  
Timetag   20  Month, Day and Time of measurement, See UTC Time
Station ID   42  Seven 6-bit ASCII character ID  
Longitude   25  Longitude in 1/1000 minute (±180 degrees, East = positive, West = negative. 181 degrees = not available)  
Latitude   24  Latitude in 1/1000 minute (±90 degrees, North = positive, South = negative. 91 degrees = not available)  
Water Level 14 Water flow in cubic meters per second (16383 = Not Available)
 Reserved   19 Reserved bits for future use  
 Total Number of bits   144