More sailings on Thursday are under threat from bad weather which is being forecast.
Voyages to Heysham tonight at 7.45pm and back to the Island at 2.15am tomorrow are already in doubt and now Thursday's 8.45am and 2.15pm services are also looking at potential disruption.
A final decision on this evenings crossing and early on Thursday will be made by 5.30pm today.
Meanwhile, a verdict on the services at 8.45am and 2.15pm on Thursday will be made no later than 7am tomorrow.
Steam Packet sailings delayed tonight
PPE Medpro put into liquidation
Part of TT course closed tomorrow
Carl Cox backs cancer charity's TT fundraising auction
Business appeal over thousands in unpaid bills
Pharmacy plans for former IOM Bank
Appeal after wood from van damages car
Island part of union data breach investigation