This excerpt taken from the TK 6-K filed May 19, 2005.
Voyage Revenues. Voyage revenues primarily include revenues from voyage charters, time charters and contracts of affreightment. Voyage revenues are affected by hire rates and the number of calendar-ship-days a vessel operates. Voyage revenues are also affected by the mix of business between time charters, voyage charters and contracts of affreightment. Hire rates for voyage charters are more volatile, as they are typically tied to prevailing market rates at the time of a voyage.