The tracking code is an identifier assigned for each ship being tracked.
| Code | Message | Description |
| 0 | Idle or initialized. The track has not yet been picked up. Will typically happen right after initiating the track and if the system is under heavy load. | |
| 1 | Tracked. This is the normal state for a ship being tracked towards a destination. | |
| 2 | Predicted. The ship has been picked up by the tracker, but have not had valid position updates for > 15 minutes. This is typical in areas covered by satellite. | |
| 3 | Too slow. The ship is being tracked but is laying still. It does not make sense to attempt to calculate an ETA. | |
| 4 | ETA deviation. The ERP ETA deviates too much from the calculated ETA. | |
| 5 | Too old. The last known position of ship is too old. It does not make sense to attempt to calculate an ETA. | |
| 9 | End of predicted route. The ship has been predicted to have reached its destination, but no valid position updates > 15 minutes. | |
| 12 | Arriving | The ship is arriving at the destination. For a port that means it is entering the port area but is still at speed. |
| 14 | Arrived | The ship has arrived at the destination. For a port that means it is laying still inside the port. The tracking is stopped |
| 16 | Departed | The ship has departed the destination. The tracking is stopped |
| 18 | Canceled | The ship track has been canceled |
| 19 | Expired | No additional AIS reports have been received for too long. The ship track is considered lost |
| 21 | Source not found | |
| 22 | Destination not found | |
| 23 | Route not found. A valid source and a valid was found, but it was not possible to find a route. Could be due to draught | |
| 24 | Invalid Track | |
| 29 | System Error |
