IALA

Water Flow Message (Seaway)

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