🔍 Key Concepts

• Purpose of instruments that measure a vessel’s motion, especially rate of turn versus direction or distance traveled • Difference between devices that show heading (where the bow is pointing) and devices that show how fast the heading is changing • Common use of compasses on the bridge compared to specialized maneuvering instruments

💭 Think About

• Ask yourself: which device on the list is specifically concerned with how quickly the vessel is changing direction, not just what direction it is pointing? • Which of these instruments would be most useful to a helmsman or pilot while executing a tight turn in a channel or during precise maneuvers? • Which options are primarily for indicating heading or distance, and which one is normally associated with indicating turning performance?

✅ Before You Answer

• Identify which choice, if any, is known in shiphandling as a maneuvering aid for controlling turns, especially at slow speed. • Eliminate any options that only provide heading information (direction the vessel is pointing) rather than rate of change of heading. • Eliminate any option that is normally used to measure distance traveled along a route rather than the vessel’s rotational movement.