What do the magnets placed in horizontal...

What do the magnets placed in horizontal trays in the compass binnacle compensate for?

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🔍 Key Concepts

• Compass binnacle correctors and what each type compensates for (vertical, horizontal, soft iron spheres, Flinders bar) • Difference between permanent magnetism and induced magnetism in a steel hull • How the orientation of magnets in trays (fore‑and‑aft vs athwartships) relates to the direction of the disturbing magnetic fields

💭 Think About

• Think about which kind of magnetic error would logically be corrected by magnets lying in a horizontal plane and adjustable in two horizontal directions around the compass. • Recall which correctors are used specifically for permanent magnetism and which ones are used for induced magnetism in soft iron. • Ask yourself: Which of the listed errors would tend to stay roughly the same over time and heading, and which ones change with heading or heel? How does that match what the horizontal tray magnets are designed to fix?

✅ Before You Answer

• Identify which device (tray magnets, Flinders bar, quadrantal spheres, heeling magnet) is associated with each type of error before picking an answer. • Verify which option describes an error that is mainly horizontal and permanent in character, since that matches horizontal tray magnets. • Eliminate any options that describe effects normally corrected by soft iron correctors (spheres, Flinders bar) or by the heeling magnet rather than by horizontal tray magnets.

🔍 Key Concepts

💭 Think About

✅ Before You Answer