The afternoon sailing from Heysham to the Island tomorrow will now set off at an earlier time.
The Ben-my-Chree service from the Lancashire port previously planned for 2.15pm on Monday will now depart at 1.45pm.
The Steam Packet Company says this is as a result of tidal restrictions at Heysham Port.
Passengers are being told to check in no later than 1.15pm.
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