Question 117Navigation General
70% to passWhich topmark shown in illustration D023NG below identifies an isolated danger?
A
A
B
B
C
C
D
D
AI Explanation
The correct answer is B. The topmark shown in illustration D023NG that identifies an isolated danger is a single black sphere. This is in accordance with the International Association of Lighthouse Authorities (IALA) Maritime Buoyage System, which specifies that an isolated danger mark should display a single black sphere as the topmark. The other answer choices do not correctly identify the topmark for an isolated danger mark. A, C, and D represent different topmarks used for other types of navigational marks, such as cardinal marks or safe water marks, but not for isolated danger marks.
Related Questions
Q@q.QuestionNumber:When determining compass error by an azimuth of Polaris, you enter the Nautical ...
Q@q.QuestionNumber:Which publication contains information on navigation regulations, landmarks, cha...
Q@q.QuestionNumber:A star that suddenly becomes several magnitudes brighter and then gradually fad...
Q@q.QuestionNumber:Solid green arrows on the main body of a pilot chart indicate _______________.
Q@q.QuestionNumber:The shortest distance between any two points on earth defines a _______________.
Ready to test your knowledge?
Take a Navigation General Practice ExamOfficial Resources
Want to practice with timed exams?
Download Coast Guard Exams for the full exam experience.
Get the App