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Which inaccuracy becomes significant when sextants are used from unstable platforms?

A)Index mirror non-perpendicularity error
B)Horizon dip calculation uncertainty
C)Shade filter alignment drifting
D)Vernier scale reading ambiguity

💡 Explanation

In rough seas, accurate determination of the visible horizon becomes unreliable because horizon dip angles vary dynamically due to wave action, which introduces errors, therefore stable sextant readings are compromised rather than internal instrument errors.

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