Characteristics of offshore operation:
(1) The natural environment and hydrometeorological changes at sea are complex, with high humidity and many waves;
(2) Ships are highly mobile, operating in different sea areas and calling at different ports and docks;
(3) The ship has a special environment, which is not only fixed but also narrow, with noise, vibration, turbulence, high temperature and air pollution; And divorced from family and society; Life is monotonous, information is scarce and slow, and the supply of fresh food and vegetables is limited;
(4) The working hours are boring, the mechanical tension is high, the duty time is long and the schedule is special, and the labor intensity and physical consumption are high. These factors seriously affect the physical and mental health of the crew, except for unpredictable special circumstances and accidents that may occur at sea at any time, which have a more obvious psychological impact on the crew.