Variation is not constant; it is different...

Question 1 of 2707066636ee928f7522a1c51a569

Variation is not constant; it is different with every change in __________.

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Question 1 of 27070

Q

Variation is not constant; it is different with every change in __________.

🔍 Key Concepts

• magnetic variation vs compass deviation • how the Earth’s magnetic field changes over the globe • what factor is printed on a nautical chart’s compass rose

💭 Think About

• Think about what variation is measured relative to: true north or the ship’s compass? • Which of these options would change if you sailed hundreds of miles without altering your course or speed? • Which factor is shown on the chart and can be different from one chart area to another?

✅ Before You Answer

• Be clear on the difference: variation = difference between true north and magnetic north; deviation = error of the ship’s compass on that vessel/heading • Ask: which choice would require me to look at the chart’s compass rose to determine its value? • Eliminate any options that are properties of the ship rather than the earth’s magnetic field/position on the globe.