Once you know what ship you are on, you can set up a
free account and get email updates about the ship's position every 12 hours, arrival at each port, and departure from each port:
MarineTraffic.com
If your ship is waiting at the Bremerhaven port and you want to guesstimate when it will be in transit, you can look at the shipping schedules to see when the next ship is arriving in Bremerhaven. Here are the schedules I could find so far:
K-Line (the ships with "Highway" in the name):
http://www.klineglobalroro.com/sched...c_schedule.pdf
Wallenius Wilhelmsen: https://www.walleniuswilhelmsen.com/schedules
ARC (American Roll-On Roll-Off Carrier) - this includes some of the Wallenius ships:
https://www.arcshipping.com/schedule...d-europe-to-us
Hoegh Autoliners (most of the ships have Hoegh in the name)
https://www.hoeghautoliners.com/sail...ade&trade=EUAF