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» Online Classroom   »   » Public Discussion of the Nav Rules   » New instructions for Quiz 4b

Author Topic: New instructions for Quiz 4b
David Burch

 - posted November 13, 2005 09:10 PM      Profile for David Burch           Edit/Delete Post 
Thanks to a series of valuable questions about this quiz, discussed in the Student Discussion Forum, we have expanded the instructions to this quiz, which now read...

This quiz is used in Lesson 4 of the Navigation Rules course and in Lesson 12 of the Radar course.

The quiz focuses on your understanding of Rule 19d for maneuvers in the fog, when viewing the other vessel by radar alone (questions marked "poor visibility"), and how these maneuver might differ when in sight of the other vessel. The test was designed by an international agency to evaluate professional mariner's understanding of Rule 19d.

Assume that in the clear weather cases, both are power-driven vessels and recall that in the fog, it would not matter what types of vessels they are or their source of power -- a basic point to check, if that is a surprise.

As such, one is looking for the best answer, not just a right answer. The best would be one that is most effective, or one that is preferable in practice for any legitimate reason. Slowing down, for example, could be the right answer, or just a legal one that postpones the real encounter, or one that would not be needed if a course change is possible, since slowing down is often a slow process and often a more complex one in many vessels. Please refer to the rules that give some guidance in these matters when options are available.

It is assumed that each clear-weather encounter involves risk of collision and each poor visibility situation involves at least the development of risk of collision, which implies that each vessel has been aware of the approaching track of the other by sight or radar observations. Also assume that each vessel has room to maneuver if called for. And final hint, in light of this discussion, review the definition of overtaking and related rules in all conditions of visibility.

The drawings are not to scale, ie they are not just a boat length apart, but you can assume that their relative positions are marked by the center point of the boats shown and that a line through their centerline marks their actual heading and course line on the water.

Last note. In our course materials (book and software) we include some sound practical advice presented in terms of a maneuvering diagram from Cockcroft. This diagram proposes slight modifications of the literal interpretation of Rule 19d in some cases. In this quiz however, if such situations arise, then choose your answers according to the literal wording of the Rules, not those of the maneuvering diagram. Not to imply this is an issue, but do not let it become one in your choice of answers. Rely strictly on the exact wording of the Rules.

More hints than this would begin to work the quiz, but nevertheless do not hesitate to ask questions in the Student Locker if something remains unclear. This is a new quiz to our course, so questions are likely to arise.

The quiz otherwise remains the same.

From: Starpath, Seattle, WA

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