Tramp steamer.

A vessel that does not transport goods on preset schedules or routes. Although the reference to ÒtrampÓ may seem to be derogatory, ships of this type are often as seaworthy and dependable as vessels operating on schedules between ports of call. Tramps are available for specific voyage needs of charterers. They will take cargo (crude oil tramps are common) when the charterer requires and to wherever the charterer desires. [ABSTRACT FROM AUTHOR]