单项选择题 With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.

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（）.