What does description of voyage mean in a Seamen's Discharge Book?

In a Seamen's Discharge Book, the "description of voyage" refers to a summary of the specific journey or trips undertaken by the sailor during their service. It typically includes details such as the ports visited, the nature of the voyage (e.g., cargo transport, passenger service), and the duration of the trip. This information helps to record the sailor's experience and qualifications, which can be important for future employment opportunities in maritime industries.