Which critical risk increased when 18th-century ships began using iron ballast near navigation equipment?

💡 Explanation

When iron ballast was placed near navigation equipment, induced magnetism from ship's structure created magnetic fields that deflected the compass needle via magnetic interference causing inaccurate readings. Therefore, compass deviation increased, rather than rudder jamming, hull weakening, or sail damage which are associated with corrosion, galvanic action or wind respectively.

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