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Johnbarrow
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GEOGRAPHY
Human Geography
Isofidia
Mapping Earth's magnetic variations with isofidia lines reveals hidden navigational challenges
24 Jan 2026
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Why are isofidia lines important for navigation?
Because they indicate the altitude of geographic features on a map.
Because they show areas of equal magnetic declination, allowing navigators to correct compass readings.
Because they connect points of equal temperature on Earth's surface.
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