Lockage Order 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 = 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 |