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Which accuracy risk increases when coastal ship navigators rely solely on repeated solar altitude readings obtained via sextant?

A)Circumferential error from thermal expansion
B)Cumulative error of estimated position
C)Deviation due to magnetic declination
D)Random bearing shift from gyro breakdown

💡 Explanation

Cumulative error increases because systematic instrument error accumulates with each observation based on dead reckoning, amplified by imperfect timekeeping. Errors add systematically creating drift, therefore position becomes less accurate rather than deviations related to instrument errors alone.

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