Manannan will operate sailings tomorrow morning and afternoon.
The fast craft will run the 8.45am service to Heysham and it's return to the Island scheduled for 2.15pm.
The Steam Packet Company says this is to allow for additional freight space on the Ben-my-Chree as it brings supplies to the Isle of Man over the Christmas period.
Meanwhile, the Ben-my-Chree service early tomorrow morning to Douglas will depart at the earlier time of 1.45am, with the vessel running the evening crossing to Heysham at 7.45pm as normal.
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