Variation is a compass error that you...

Variation is a compass error that you...

Question 1 of 2707066636ee928f7522a1c51a568

Variation is a compass error that you __________.

Question 1 of 27070

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Variation is a compass error that you __________.

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🔍 Key Concepts

• variation vs. deviation – know what causes each error • how earth’s magnetic field and local magnetic influences affect a compass • which parts of compass error can be fixed by adjusting magnets or soft iron on the vessel

💭 Think About

• Ask yourself: Is variation the error caused by the ship’s own magnetism, or by the difference between true north and magnetic north? • Which one (variation or deviation) is shown on the compass rose of a chart and changes with geographic location, not with the ship? • If you move your ship but do not touch the compass or its magnets, can you mechanically remove this type of error, or must you allow for it in your calculations instead?

✅ Before You Answer

• Be clear on the definition: variation = difference between true north and magnetic north at a location • Remember that compensating magnets and soft iron correct only deviation, not variation • Confirm whether you deal with variation by mechanical adjustment of the compass or by applying a numerical correction in your navigation work