The head of Tasmania's peak tourism body Luke Martin has described as "absurd" a suggestion by Incat boss of a day sailing across Bass Strait.
Mr Martin said the future of Bass Strait passenger transport was far too important to Tasmania's economy to be "kite flying proposals that have no business case".
"There is no business case for this thought bubble," Mr Martin said.
"This debate about Bass Strait is beyond absurd.
"TT-Line has spent six years on the best model which has been endorsed by the government twice and we should have had a ship in the Mersey at the end of the year.
"The biggest tragedy would be if we stuff up this model that has worked well for 20 years."
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Incat chairman Robert Clifford, AO, has flagged an extra passenger day sailing service across Bass Strait - from another port - in addition to the night sailing to and from Devonport - to double tourist numbers. "We think there's room for a day sailing, and we're proposing a day sailing ship as part of the solution," he said.
However, Mr Martin, the chief executive of the Tourism Industry Council Tasmania believes Incat's suggestion would see a duplication of ground crews, quarantine, marketing and product delivery and did not answer questions about freight.
"Mr Clifford's concept bears no relevance to the comprehensive business case prepared by TT Line to replace the current Spirits, that has our full support and was endorsed by the Tasmanian Government," he said.
"For a start who would run the service?"
Mr Martin said he understood why the government was looking at other options for the building of ships to replace the two Spirits but it was "incredibly frustrating" a decision was dragging on.
"The state Government needs to wrap up this vessel replacement task force and get on with getting us the ships we need."
While a previous Incat catamaran service across Bass Strait had failed, Mr Martin said he understood why Incat was keen to have one of its catamarans crossing Bass Strait.
"Incat ships are magnificent and I don't blame Bob because he's trying to get a ship built here, but show me the business case.," he said.
"You can't just take a speculative punt on this."
Meanwhile, TT-Line is pleased at the popularity of the 'Bring your car for free' promotion made possible by a temporary increase to the Bass Strait Passenger Vehicle Equalisation Scheme.
"Twenty five per cent of the government's initial allocation has been taken up, which is a significant positive for the state's tourism sector," a TT-Line spokesman said.
"More broadly, people are travelling on board the Spirits, and we expect this number will continue to increase when there is greater certainty around interstate borders."