It was a couple days after it left that it updated on the 1800#. I tracked my VIN at the W&W website the morning after the Independence II sailed and saw that my car was indeed on board. It was a couple of days after that that the 1800# updated. It was another day or more until the website switched to "en route".
Since the Don Juan appears to be a W&W vessel,
you can put your VIN in here to see if it's on board. Enter your VIN at Cargo ID.
**edit**
The Independence II went out of range in the Celtic Sea two days ago, so I guess it'll pick it back up again once it nears Halifax next week.