Which navigational error arises when a sextant mirror's perpendicularity shifts during a transatlantic voyage?

💡 Explanation

When a sextant mirror shifts, a systematic error introduces bias into all angle measurements as the internal geometry of reflection is skewed, affecting all observations equally. Therefore a systematic error results, rather than random errors, latitudinal bias, or visibility issues, which arise from different mechanisms such as observational errors, map projections, or weather conditions.

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