Cardtronics Inc.'s agreement to deploy automated teller machines aboard five Carnival Cruise Line ships is a sign of growing competition in this lucrative niche.

The gain for Cardtronics, which announced the multiyear deal Monday, comes at the expense of BankAtlantic Bancorp Inc., which has operated ATMs since the late 1990s on Carnival ships and those of four other cruise lines, Celebrity, Princess, Royal Caribbean and Cunard.

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