The T&T Spirit is to be taken off service on Wednesdays as part of a new maintenance schedule.
The Port Authority says this arrangement will commence from Wednesday 23rd May, 2018.
It says that the schedule will be adjusted within any week that there is an expected increase in demand and that travellers will be advised.
The Port Authority says Wednesdays are usually short sailing days as the demand for the service on this day is usually low, and the vessel operates at 6.30 am from Tobago and 12.00 noon from Port of Spain.
It says that at this time there are a number of customers who would have purchased tickets to travel on the following Wednesdays - May 23, June 06, 13, & 27 & July 04 which are now cancelled.
"To the affected persons we asked that you can use your travel tickets on any day that is convenient to you during the period May 21 – July 07, 2018. There is no need to revalidate your tickets," the Port Authority says.
It says that as at April 30, 2018 the T&T Spirit made a total of 30 trips to and from Tobago and carried 11,933 passengers and 3574 vehicles.