The capital, which was provided through the Scottish Loan Fund, could rise to £5m if Fletcher decides to draw down extra funds for the platform support ship.
Fletcher already owns two ships, which are used to ferry food, equipment and other supplies to the offshore oil and gas industry.
The SLF, which Maven manages, was established by the Scottish Investment Bank, a division of Scottish Enterprise, to help address a specific funding gap in the SME market across Scotland.
It aims to assist businesses that cannot access additional bank debt to support growth plans.
Four Scottish businesses received £5m of funding from the fund in July, with the option of drawing down up to £9m.
The fund has now committed more than £20m to help Scottish companies expand abroad.
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