The Steam Packet company says three sailings are facing delays today.
On its website, the ferry firm says there's insufficient water depth in Douglas harbour because of dredging issues.
As a result, the Manxman's 8.30am Douglas to Heysham trip will now set off at 9.30am.
Her 2.30pm return will now leave Heysham at 3.30pm, while her 7.45pm Douglas to Heysham voyage will set off off at 8.30pm.
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