Senior figures at the Steam Packet have been called before a Tynwald Select Committee examining the company's User Agreement.
The chairman, chief executive and commercial director will give evidence to the hearing on January 30.
Onchan MHK Peter Karran was among those who presssed for a Tynwald Committee to be set up - to examine whether the User Agreement is in the Island's best interests.
The hearing is in the Millennium Room at Legislative Buildings on Finch Road in Douglas, starting at 10.30am.
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