Lockage Order Message (Seaway)

Registrant: 
Saint Lawrence Seaway Development Corporation
Message number: 
6
DAC: 
316
FI: 
2
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 = 1 (00 0001 in binary)  
Timetag 20 Month, Day and Time of Message,
Lock ID 42 Seven characters in 6 bit ASCII. “@@@@@@@” = not available
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)
Reserved 9 Reserved bits for future use
Lock Schedule Min 120
Max 720
Each Lock Order Message contains up to 6 lock schedule reports
structured as defined in next table.
 Total Number of bits    Min 264
Max 864
 = 144 + N*120   
       N Total Bits    (Slots Required)  
       1 264 bits    (2 slots)  
       2 384 bits    (3 slots)  
       3 504 bits    (3 slots)  
       4 624 bits    (4 slots)  
       5 744 bits    (4 slots)  
       6 864 bits    (5 slots)  

Lock Schedule Report

 Parameter    Number of bits    Description  
Vessel Name 90 15 characters in 6-bit ASCII. “@@@@@@@@@@@@@@@” = not
available
Direction  1 TRUE = Up bound = 1, FALSE = Down bound = 0
ETA 20 Estimated time of arrival
Reserved  9 Reserved bits for future use
 Total Number of bits   120