Deviation is caused by _________

Deviation is caused by __________.

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🔍 Key Concepts

• Deviation vs. Variation – understand the difference between errors caused by the ship and errors caused by the Earth • How metal objects and electrical systems on board a vessel can affect the ship’s compass • Which option refers to local/shipboard effects versus large‑scale geographic or global magnetic effects

💭 Think About

• Ask yourself: which answer describes something unique to this particular vessel as opposed to the whole Earth or a large geographic area? • Look at each choice and decide: is this effect coming from the Earth’s magnetism, or from the vessel and its equipment? • Think about standard compass correction tables on board: which error changes when you move equipment or change cargo on your ship rather than when you change location on the globe?

✅ Before You Answer

• Be sure you can clearly define deviation as a compass error caused by the vessel itself • Be sure you can clearly define variation as the difference between true north and magnetic north caused by the Earth’s magnetic field • Before choosing, classify each option as either ship-caused or Earth/geography-caused and then match that to the definition of deviation

🔍 Key Concepts

💭 Think About

✅ Before You Answer