They are Kents only BSUK affiliated adult league team. They are part of the newely formed Kent Baseball Club which also consists of Tonbridge Bronco's.
In 2007, Medway Mariners joined the British Baseball Federation and debuted in the Division 2 South league. Medway Mariners finished the season with a 10-0 record and was promoted to British AA - South. In 2008, Medway Mariners won the Frank Brady Memorial Trophy.
In 2009, Medway Mariners changed their club name to Kent Mariners.