This afternoon's (Thursday) sailing from Heysham has been brought forward after problems with silting in the Lancashire port.
The Steam Packet Company said this afternoon's sailing from Heysham to Douglas, due to leave at 13:15 will now leave at 12.30.
Passengers are being asked to check-in no later than 12:00.
At the time of writing, this evening's sailing from Douglas to Heysham scheduled for 19:00, remains unaffected.
How will Manx Care reduce the number of negligence claims?
Manx Language Festival to be held next week
Manxman sailings in doubt from tomorrow
Car falls down steep bank on Mountain Road
Panic over - Mcdonald's reopens at 11am tomorrow
Police say beat it to cars illegally parked during MJ tribute act
No dedicated prostate cancer screening programme, despite over 1,200 referrals
Minister says GP waiting times have improved, but delays still impact A&E