The Steam Packet says it's cancelled its Saturday afternoon sailing because of bad weather.
Manxman's 3pm crossing from Douglas to Liverpool will no longer be going ahead.
It means her return voyage to Douglas is also off, having been scheduled for 8pm that evening, Saturday, April 4.
Meanwhile three other sailings are also listed as being at risk that day, as is the overnight sailing from Heysham to Douglas on Sunday, April 5.
It comes as Storm Dave is expected to hit the Island on Saturday evening.
Rapists's appeal against sentence thrown out
Last chance to become next TT's charity partner
No gas price hike after regulator review
Cafe hits back after staff abused
Online appointments being considered by sexual health clinic
Treasury can’t say how much is made from medicinal cannabis
Road closures planned for tin baths this weekend
DOI has no junction safety concerns over Iceland plans