Which navigational risk increased during long 18th-century sea voyages when using brass-framed sextants under humid conditions?

💡 Explanation

When brass sextants faced humid conditions, galvanic corrosion occurred because the different metals created a voltaic cell, causing oxidation. Therefore, corrosion would introduce inaccuracies rather than loss of horizon, parallax error, or magnetic interference which are related to other mechanisms or environmental factors entirely.

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