Which consequence resulted for 18th-century warships using iron ballast?

💡 Explanation

Navigational error occurs because iron ballast introduces magnetic deviation into the ship's local environment; this causes magnetic COMPASS DEVIATION. Therefore, compass readings become unreliable, rather than structural issues because of the location, or inaccuracies with fouling.

• Which risk increases when subsurface pressure alters voids underlying pietra dura during differential expansion?
• Which outcome resulted from silt accumulation altering flow?
• Which navigational uncertainty increased if an 18th-century ship's chronometer experienced a sudden rate change during a long voyage?
• Which consequence occurred due to differential seasoning when constructing early 18th-century plank keels?
• Which constraint limited the height of ancient Mesopotamian bronze towers?
• Which structural response to ground settlement was implemented in Pisa's leaning tower construction?