单项选择题
A.active weather disturbances such as hurricanes or tropical storms
B.the latest navigational warnings
C.scheduled vessel arrivals and departures for a 24-hour period
D.water levels at river ports where run-off affects tidal heights
单项选择题 The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
单项选择题 The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.
单项选择题 The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.