Which navigational inaccuracy increases when performing a sextant altitude sighting from a ship's mast in heavy seas?

💡 Explanation

Horizon dip estimation worsens because wave action induces substantial apparent vertical motion, affecting the perceived horizon; therefore, sextant measurements become unreliable, rather than being subject to parallax, index error, or reflection issues.

• In early Chinese gunpowder experiments, which risk increased when alchemists maximized sulfur content?
• Which outcome occurs when an 18th-century wooden ship undergoes prolonged immersion in saltwater, despite copper sheathing?
• Which improvement did Al-Khwarizmi introduce with transformative impact in early practical land surveying and irrigation planning?
• Which consequence arose when seasonal Euphrates flooding increased silt deposition into irrigation canal networks of ancient Sumeria?
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• Which outcome resulted from prolonged exposure of arsenical bronze tools to acidic soil in ancient Mesopotamia?