单项选择题
A.Rate of turn
B.Latitude and longitude
C.Navigational status
D.All of the above
单项选择题 With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
单项选择题 While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
单项选择题 Which statement concerning GPS is TRUE（）.