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Which error increases when inaccurate bubble levels are used on a marine sextant's artificial horizon?

A)Instrument parallax during target alignment
B)Index error during initial calibration
C)Dip error due to sea horizon obscurity
D)Vertical angle error during celestial observation

💡 Explanation

When levels are off, the reflected horizon is tilted relative to true horizontal causing a vertical angle error affecting altitude measurements. Therefore, vertical angle error results, rather than parallax, index error, or dip error, which stem from other sources of optical misalignment or horizon limitations.

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