The Steam Packet's rescheduling two sailings on Tuesday as the Manxman undergoes maintenance.
Her scheduled 8.30am crossing from Douglas to Heysham will be covered by the Manannan, and set off at 7.30am instead on Tuesday, June 16.
Meanwhile the return trip from Lancashire, which had been due for 2.15pm, will now be leaving at 11.30am.
The company says there will be a coach transfer from Lancaster Station to Heysham at 10am.
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