（）is not a type of IALA maritime buoyage system.

Which instrument is used to predict the approach of a low pressure system（）.

When steering a tow downstream around the shape of a sand bar，and staying on the proper side of the buoys，an operator should be cautious of（）.

You are running parallel to the coast and estimate that the current is against you.In plotting a running fix using bearings from the same object on the coast，the greatest safety margin from inshore dangers will result if what speed is used to determine（）.

Preferred channel marks are colored with（）．

You are approaching a vertical lift bridge.You know the span is fully open when（）.

You are sailing south on the Intracoastal Waterway（ICW）when you sight a green can buoy with a yellow square painted on it.Which of the following is TRUE（）.

When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind，the approach is best made（）.

You are drifting in a locale where there is no current．As a rule，your vessel will lie（）.

The approach to the roads and harbor from the（）entails no difficulty.