The Steam Packet Company says the Manannan's sailings to Liverpool will take extra time as engineers repair one of its four engines.
The company says crossings will now take three and a half hours instead of the usual 2 hours 45 minutes.
As a result, it's rescheduled some of the weekend's voyages between Douglas, Liverpool and Dublin.
You can find out more on the company's website.
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police
"No dispute" over Liverpool Ferry Terminal, says main contractor
More weekend bus strikes to come after 10-day walkout?
Minister to face question about bus strike