The rules state that vessels may depart from the requirements of the Rules when（）.

You are making tow.A loaded，open-hopper barge with independent tanks has placards，with alternating red and white quadrants，located at each side and end.You inspect the barge and find slight traces of water in the wing voids due to condensation.What（）.

When underway and proceeding ahead，as the speed increases，the pivot point tends to（）.

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

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

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（）.

Which vessel would display a cone，apex downward（）.

You are steaming in a westerly direction along the Gulf Coast.You see ahead of you a lighted buoy showing a red isophase light.Which action should you take（）.

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

Preferred channel marks are colored with（）．