Question 604Navigation General

70% to pass

The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?

A By starting the compass with the spin axis in a north/south position
B The rotation of the Earth (Earth rate) automatically aligns the gyroscope with north, except for speed errors
C By mechanically or electrically applying forces to precess the gyroscope
D By taking advantage of the property of gyroscopic inertia
AI Explanation

The correct answer is C) By mechanically or electrically applying forces to precess the gyroscope. A gyroscope's spin axis tends to remain fixed in space, but this alone does not make it "north seeking" for use as a compass. To align the gyroscope with north, forces must be applied to precess or rotate the gyroscope's spin axis until it points to true north. This can be done mechanically, such as with a gimbaled mount, or electrically, by applying current to torque motors that induce precession. The other answer choices are incorrect because they do not fully explain how a gyroscope is made to point north for compass use.

Related Questions
Q82:Some lights used as aids to marine navigation have a red sector to indicate a da... Q1361:A rotary current sets through all directions of the compass. The time it takes t... Q424:What is the approximate geographic range of Race Rock Light, NY, if your height ... Q450:A chart has extensive corrections to be made to it. When these are made and the ... Q10:The annual change in variation for an area can be found in _______________.

Ready to test your knowledge?

Take a Navigation General Practice Exam
Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

App Store