The Manannan has been fixed.
Problems with her engines last night led to the cancellation of the sailing from Merseyside, and today's journey to Belfast.
Specialists were brought in this morning to take a look at the electronic management systems, which it was thought were being affected by one of the engines not running at the moment.
The vessel left Liverpool around 12.30pm.
Taxi fares on the Island to rise
RTLC determines maximum fares to be charged later this month
Bus Vannin warns of services at risk this evening
Bus operator says eight services may not go ahead
Weather causes changes to today's sailing schedule
Some services cancelled while Larne crossings pushed back 24 hours
Kewaigue closure in place this weekend for manhole replacement
Manx Utilities says a further closure will be needed next weekend