Terms of the three-year contract were not disclosed.
SeaMobile has already installed VSAT (very small aperture terminal) services on two of the vessels and expects to install the third ship by the end of September.
The contract will also include the provision of SeaMobile's 'OceanPhone' prepaid calling cards, to be used for crew communications services.
SeaMobile says that it now provides broadband satellite services to more than 300 maritime vessels around the world.