Lockage Order Message (Seaway)

Registrant:

Saint Lawrence Seaway Development Corporation

Message number:

6

DAC:

366

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