如何判断并排除水泵轴承过热故障

A. reduce the navigational workload compared to using the paper chart
B. enable mariner to execute in a convinient and timely manner all route planning, route monitoring and positioning currently performed on paper charts
C. be able to plot ships position continuously and automatically
D. be used for the display of radar, radar tracked target information, AISand other appropriate data layers to assist in route monitoring