An ocean crosser is a type of vessel that is used to travel across oceans. The most common type of ocean crosser is a LINER, which is a large passenger ship that carries passengers and cargo from one port to another. Freighters are also used to transport goods across oceans, but they are larger and more heavily loaded than liners. The fastest type of ocean crosser is the supersonic transport (SST), which is capable of traveling at speeds up to Mach 2.5.